Journal of Pathology and Translational Medicine

Case Studies

Recurrent malignant solitary fibrous tumor of the scalp: a case report and literature review: Ahmed Rabie, Abdulkarim Hasan, Yasein Mohammed, Ayman Abdelmaksoud, Ali A. Rabaan; J Pathol Transl Med. 2022;56(2):103-108. Published online January 21, 2022; DOI: https://doi.org/10.4132/jptm.2021.10.29

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Solitary fibrous tumor (SFT) is a rare type of mesenchymal neoplasm that first was discovered in the pleura but can also affect the peritoneum, lungs, mediastinum, and skin. Cutaneous malignant SFT is an extremely rare tumor that resembles dermatofibrosacoma protuberance (DFSP) histologically and immunohistochemically. Herein, we describe a case of malignant SFT that presented as a recurrent mass on the scalp. The first lesion was totally excised one year before recurrence and was diagnosed as a DFSP based on the histopathology and cluster of differentiation 34 immunostaining positivity. Re-examination of the previously examined specimen was considered. Activator of transcription 6 positivity was also detected in the tissue, confirming the diagnosis of a recurrent malignant SFT rather than DFSP. There was no evidence of recurrence, locoregional, or distant metastases at six months after lesion removal with a safety margin.

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Prolonged generalized osteomalacia associated with a sinonasal cavity phosphaturic mesenchymal tumor: A case report
Mehdi Montazer, Naser Tayyebi Meibodi, Elmira Teymouri, Zohreh Mousavi, Sedigheh Reisian, Motahare Ebrahimnejad
Clinical Case Reports.2024;[Epub] CrossRef
Giant Cell Tumor of Soft Tissue on the Forearm Skin: Case Report and Literature Review
Abdulkarim Hasan, Khalid Nafie, Mohamed Adwi, Ayman Abdelmaksoud, Mohammed S. Abdelwahed, Abdulhadi Samman, Mohammad A. Alghamdi, Hasan S. Al-Ghamdi, Hind Ali Hendi, S. K. A. Horsu
Open Access Macedonian Journal of Medical Sciences.2023; 11(C): 71. CrossRef
Primary sclerosing liposarcoma of the ovary: Case report and a review of the literature
Thyagaraja Dhanurjaya, Turnbull Hilary, Jasenka Mazibrada
International Journal of Surgery Case Reports.2023; 109: 108513. CrossRef
Favorable outcome of a histiocytic sarcoma patient treated with immune checkpoint inhibitor: a case report
Long Thanh Nguyen, Giang Hoang Pham, Phuong Thi Vu, Hyeon Gyu Yi
Annals of Medicine & Surgery.2023; 85(12): 6274. CrossRef
Adrenal Solitary Fibrous Tumor: A Case Report
Elena Casademunt-Gras, Isabel Salinas, Pau Moreno Santabarbara, Gustavo Tapia Melendo, Jordi L Reverter
Cureus.2023;[Epub] CrossRef
A Rare Case of Malignant Solitary Fibrous Tumor on the Scalp
Kwang-Ryeol Kim, Ki Hong Kim
Keimyung Medical Journal.2023; 42(2): 107. CrossRef

Frozen Cytology of Meningeal Malignant Solitary Fibrous Tumor/Hemangiopericytoma: Myunghee Kang, Na Rae Kim, Dong Hae Chung, Gie-Taek Yie; J Pathol Transl Med. 2019;53(3):192-197. Published online April 11, 2019; DOI: https://doi.org/10.4132/jptm.2019.03.20

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Abstract PDF

A 51-year-old woman presented with severe dizziness. The brain magnetic resonance image revealed a 5.5 cm multiloculated mass with a thick rim in the left temporal lobe. Cytological examination of frozen diagnosis of the mass showed hypercellular sheets of round and rhabdoid cells in a hemorrhagic background, and two mitotic figures were observed. Histologically, the excised dura-based mass consisted of predominantly round cells with small foci of rhabdoid tumor cells in a pseudoalveolar pattern in a hemorrhagic background, and the cells showed nuclear positivity for signal transducer and activator of transcription 6 as well as frequent mitosis. The mass was diagnosed as a grade 3 solitary fibrous tumor (SFT)/hemangiopericytoma (HPC). The cytological diagnosis of SFT/HPC is challenging because of the heterogeneous cytological findings, such as histological heterogeneity, and because there are no standardized cytological criteria for malignant SFT/HPC. Cytological findings, such as singly scattered small cells, hypercellularity, rare ropy collagen, and round and rhabdoid cells with pseudoalveolar pattern, may assist in the diagnosis of malignant SFT/HPC.

Citations

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Cytologic features of mesenchymal, melanocytic and haematolymphoid tumours of the central nervous system and metastases
Carmen Bárcena, José A. Jiménez‐Heffernan
Cytopathology.2023;[Epub] CrossRef
Scoring system for intraoperative diagnosis of intracranial schwannoma by squash cytology
Hirotaka Fujita, Takuma Tajiri, Tomohisa Machida, Nozomi Nomura, Suguru Toguchi, Hitoshi Itoh, Shinichiro Hiraiwa, Tomoko Sugiyama, Chie Inomoto, Masaaki Imai, Shinri Oda, Masami Shimoda, Naoya Nakamura
Cytopathology.2022; 33(2): 196. CrossRef
Occurrence of a solitary fibrous tumor adjacent to the resection bed of a high-grade meningioma: A case report
Coby Cunningham, Rocco Dabecco, Justin Davanzo
Interdisciplinary Neurosurgery.2021; 25: 101277. CrossRef
A case of solitary fibrous tumor arising in the meninge
Saori NAKANISHI, Naoto KURODA, Toshiko TAKAI, Mari KOJIMA, Misato OONOGI
The Journal of the Japanese Society of Clinical Cytology.2021; 60(4): 224. CrossRef
Intraoperative frozen cytology of intraosseous cystic meningioma in the sphenoid bone
Na Rae Kim, Gie-Taek Yie
Journal of Pathology and Translational Medicine.2020; 54(6): 508. CrossRef

Malignant Solitary Fibrous Tumor with Heterologous Rhabdomyosarcomatous Differentiation: A Case Report: Jeong-Hwa Kwon, Joon Seon Song, Hye Won Jung, Jong-Seok Lee, Kyung-Ja Cho; J Pathol Transl Med. 2017;51(2):171-175. Published online February 3, 2017; DOI: https://doi.org/10.4132/jptm.2016.08.29

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Abstract PDF

Malignant solitary fibrous tumor (MSFT) is a well-described entity, from which heterologous differentiation is extremely rare. We encountered a case of MSFT with rhabdomyosarcomatous differentiation in a 56-year-old man. This patient presented with a large mass in his posterior thigh. He had been treated with chemoradiation for sarcoma involving the cervical spine, right femoral head, and both lungs 6 months earlier. A wide excision was performed. The mass measured 10.6 cm and showed a fish-flesh cut surface with necrotic foci. Microscopically, the tumor showed heterogeneous cellularity with a hemangiopericytic vascular pattern. A hypercellular area showed spindle cells or epithelioid cells with high mitotic activity (63/10 high-power fields) and immunoreactivity for CD34 and CD99. A hypocellular area and a cystic area showed pleomorphic rhabdoid cells with immunoreactivity for desmin and myogenin. This is a report of a rare case of MSFT with rhabdomyosarcomatous differentiation and presents new histologic features of MSFT.

Citations

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A Rare Case of Malignant Solitary Fibrous Tumor on the Scalp
Kwang-Ryeol Kim, Ki Hong Kim
Keimyung Medical Journal.2023; 42(2): 107. CrossRef
Malignant solitary fibrous tumor of maxilla presenting as proptosis: A case report
Pravin Kumar, Arpita Jindal, Bhushan Bhalgat, Phanindra Kumar Swain, Raj Govind Sharma
Journal of Cancer Research and Therapeutics.2023; 19(Suppl 2): S991. CrossRef
Recurrent malignant solitary fibrous tumor of the scalp: a case report and literature review
Ahmed Rabie, Abdulkarim Hasan, Yasein Mohammed, Ayman Abdelmaksoud, Ali A. Rabaan
Journal of Pathology and Translational Medicine.2022; 56(2): 103. CrossRef
Frozen Cytology of Meningeal Malignant Solitary Fibrous Tumor/Hemangiopericytoma
Myunghee Kang, Na Rae Kim, Dong Hae Chung, Gie-Taek Yie
Journal of Pathology and Translational Medicine.2019; 53(3): 192. CrossRef

Original Article

Meningeal Solitary Fibrous Tumors with Delayed Extracranial Metastasis: Nayoung Han, Hannah Kim, Soo Kee Min, Sun-Ha Paek, Chul-Kee Park, Seung-Hong Choi, U-Ri Chae, Sung-Hye Park; J Pathol Transl Med. 2016;50(2):113-121. Published online December 14, 2015; DOI: https://doi.org/10.4132/jptm.2015.10.30

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Abstract PDF

Background
The term solitary fibrous tumor (SFT) is preferred over meningeal hemangiopericytoma (HPC), because NAB2-STAT6 gene fusion has been observed in both intracranial and extracranial HPCs. HPCs are now considered cellular variants of SFTs. Methods: This study analyzes 19 patients with STAT6-confirmed SFTs, who were followed for over 11 years in a single institution. Ten patients (10/19, 56.2%) had extracranial metastases (metastatic group), while the remainder (9/19) did not (non-metastatic group). These two groups were compared clinicopathologically. Results: In the metastatic group, the primary metastatic sites were the lungs (n = 6), bone (n = 4), and liver (n = 3). There was a mean lag time of 14.2 years between the diagnosis of the initial meningeal tumor to that of systemic metastasis. The median age at initial tumor onset was 37.1 years in the metastatic group and 52.5 in the non-metastatic group. The 10-year survival rates of the metastatic- and non-metastatic groups were 100% and 33%, respectively. The significant prognostic factors for poor outcomes on univariate analysis included advanced age (≥45 years) and large initial tumor size (≥5 cm). In contrast, the patients with higher tumor grade, high mitotic rate (≥5/10 high-power fields), high Ki-67 index (≥5%), and the presence of necrosis or CD34 positivity showed tendency of poor prognosis but these parameters were not statistically significant poor prognostic markers. Conclusions: Among patients with SFTs, younger patients (<45 years) experienced longer survival times and paradoxically had more frequent extracranial metastases after long latent periods than did older patients. Therefore, young patients with SFTs require careful surveillance and follow-up for early detection of systemic metastases.

Citations

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Meningeal Solitary Fibrous Tumor: A Single-Center Retrospective Cohort Study
Siyer Roohani, Yasemin Alberti, Maximilian Mirwald, Felix Ehret, Carmen Stromberger, Soleiman Fabris Roohani, Katja Bender, Anne Flörcken, Sven Märdian, Daniel Zips, David Kaul, Manish Charan
Sarcoma.2024; 2024: 1. CrossRef
De-differentiation associated with drop metastasis of a recurrent intracranial solitary fibrous tumor: a case report and literature review
Chenhui Zhao, Xiran Fan, Wanwan Gao, Fan Zhang, Haijun Lv, Xiaochun Jiang, Guangfu Di
International Journal of Neuroscience.2022; 132(8): 843. CrossRef
Long-term extracranial metastatic relapse of an intraventricular solitary fibrous tumor: a case report
Tarek Assi, Elie Samaha, Hussein Nassereddine
Anti-Cancer Drugs.2022; 33(1): e764. CrossRef
Multidisciplinary Treatment of Liver Metastases from Intracranial SFTs/HPCs: A Report of Three Consecutive Cases
Felix J. Krendl, Franka Messner, Gregor Laimer, Angela Djanani, Andreas Seeber, Georg Oberhuber, Dietmar Öfner, Dominik Wolf, Stefan Schneeberger, Reto Bale, Christian Margreiter
Current Oncology.2022; 29(11): 8720. CrossRef
A review of solitary fibrous tumor/hemangiopericytoma tumor and a comparison of risk factors for recurrence, metastases, and death among patients with spinal and intracranial tumors.
Enrico Giordan, Elisabetta Marton, Alexandra M. Wennberg, Angela Guerriero, Giuseppe Canova
Neurosurgical Review.2021; 44(3): 1299. CrossRef
Intracranial Solitary Fibrous Tumor of the Skull Base: 2 Cases and Systematic Review of the Literature
Sricharan Gopakumar, Visish M. Srinivasan, Caroline C. Hadley, Adrish Anand, Marc Daou, Patrick J. Karas, Jacob Mandel, Shankar P. Gopinath, Akash J. Patel
World Neurosurgery.2021; 149: e345. CrossRef
Hemangiopericytoma/Solitary Fibrous Tumor in the central nervous system. Experience with surgery and radiotherapy as a complementary treatment: A 10-year analysis of a heterogeneous series in a single tertiary center
Pedro Miguel González-Vargas, José Luis Thenier-Villa, Pablo Sanromán Álvarez, Alexandre Serantes Combo, Lourdes Calero Félix, Raúl Alejandro Galárraga Campoverde, Eva Azevedo González, Álvaro Martín-Gallego, Rosa Martínez-Rolan, Adolfo de la Lama Zaragoz
Neurocirugía.2020; 31(1): 14. CrossRef
Hemangiopericytoma/Solitary Fibrous Tumor in the central nervous system. Experience with surgery and radiotherapy as a complementary treatment: A 10-year analysis of a heterogeneous series in a single tertiary center
Pedro Miguel González-Vargas, José Luis Thenier-Villa, Pablo Sanromán Álvarez, Alexandre Serantes Combo, Lourdes Calero Félix, Raúl Alejandro Galárraga Campoverde, Eva Azevedo González, Álvaro Martín-Gallego, Rosa Martínez-Rolan, Adolfo de la Lama Zaragoz
Neurocirugía (English Edition).2020; 31(1): 14. CrossRef
Solitary fibrous tumor/hemangiopericytoma: treatment results based on the 2016 WHO classification
Kyoung Su Sung, Ju Hyung Moon, Eui Hyun Kim, Seok-Gu Kang, Se Hoon Kim, Chang-Ok Suh, Sun Ho Kim, Kyu-Sung Lee, Won Seok Chang, Jong Hee Chang
Journal of Neurosurgery.2019; 130(2): 418. CrossRef
Grading of meningeal solitary fibrous tumors/hemangiopericytomas: analysis of the prognostic value of the Marseille Grading System in a cohort of 132 patients
Nicolas Macagno, Rob Vogels, Romain Appay, Carole Colin, Karima Mokhtari, Benno Küsters, Pieter Wesseling, Dominique Figarella‐Branger, Uta Flucke, Corinne Bouvier
Brain Pathology.2019; 29(1): 18. CrossRef
Solitary fibrous tumor of the pineal region with delayed ectopic intracranial metastasis: A case report and review of the literature
Yongjie Wang, Jingying Zhang, Qichang Liu, Fuyi Liu, Xiangdong Zhu, Jianmin Zhang
Medicine.2019; 98(21): e15737. CrossRef
Case report: neonatal giant forehead hemangiopericytoma with a 5-year follow-up
AiJun Peng, LiBing Zhang, Hai Zhao, LiangXue Zhou
Medicine.2019; 98(47): e17888. CrossRef
Liquid Biopsy in Rare Cancers: Lessons from Hemangiopericytoma
Chiara Nicolazzo, Luciano Colangelo, Alessandro Corsi, Guido Carpino, Angela Gradilone, Chiara Sonato, Cristina Raimondi, Eugenio Gaudio, Paola Gazzaniga, Walter Gianni
Analytical Cellular Pathology.2018; 2018: 1. CrossRef
Surveillance for metastatic hemangiopericytoma-solitary fibrous tumors-systematic literature review on incidence, predictors and diagnosis of extra-cranial disease
Tarini Ratneswaren, Florence Rosie Avila Hogg, Mathew Joseph Gallagher, Keyoumars Ashkan
Journal of Neuro-Oncology.2018; 138(3): 447. CrossRef
Intracranial Solitary Fibrous Tumor
Eveline Claus, Patrick Seynaeve, Jeroen Ceuppens, Alain Vanneste, Koenraad Verstraete
Journal of the Belgian Society of Radiology.2017;[Epub] CrossRef
Comparison and evaluation of risk factors for meningeal, pleural, and extrapleural solitary fibrous tumors: A clinicopathological study of 92 cases confirmed by STAT6 immunohistochemical staining
Ji Min Kim, Yoon-La Choi, Yu Jin Kim, Hyung Kyu Park
Pathology - Research and Practice.2017; 213(6): 619. CrossRef
Molecular Testing of Brain Tumor
Sung-Hye Park, Jaekyung Won, Seong-Ik Kim, Yujin Lee, Chul-Kee Park, Seung-Ki Kim, Seung-Hong Choi
Journal of Pathology and Translational Medicine.2017; 51(3): 205. CrossRef
Solitary fibrous tumour presenting with a single bone metastasis: report of six cases and literature review
Vittoria Colia, Salvatore Provenzano, Carlo Morosi, Paola Collini, Salvatore Lorenzo Renne, Paolo G. Dagrada, Claudia Sangalli, Angelo Paolo Dei Tos, Andrea Marrari, Paolo G. Casali, Silvia Stacchiotti
Clinical Sarcoma Research.2016;[Epub] CrossRef

Case Study

A Solitary Fibrous Tumor with Giant Cells in the Lacrimal Gland: A Case Study: Da Hye Son, Su Hyun Yoo, Ho-Seok Sa, Kyung-Ja Cho; Korean J Pathol. 2013;47(2):158-162. Published online April 24, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.2.158

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Abstract PDF

Orbital solitary fibrous tumor (SFT) has recently been proposed as the encompassing terminology for hemangiopericytoma, giant cell angiofibroma (GCAF), and fibrous histiocytoma of the orbit. The lacrimal gland is a very rare location for both SFT and GCAF. A 39-year-old man presented with a painless left upper eyelid mass. An orbital computed tomography scan identified a 1.1 cm-sized well-defined nodule located in the left lacrimal gland. He underwent a mass excision. Histopathologic examination showed a proliferation of relatively uniform spindle cells with a patternless or focally storiform pattern. Dilated vessels were prominent, but angiectoid spaces lined with giant cells were absent. Floret-type giant cells were mostly scattered in the periphery. The tumor was immunoreactive for CD34 and CD99, but negative for smooth muscle actin and S-100 protein. This is the first Korean case of SFT of the lacrimal gland with overlapping features of GCAF, suggesting a close relationship between the two entities.

Citations

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A review of solitary fibrous tumours of the orbit and ocular adnexa
Cornelius René, Paolo Scollo, Dominic O’Donovan
Eye.2023; 37(5): 858. CrossRef
A giant orbital solitary fibrous tumor treated by surgical excision: a case report and literature review
Qi Zhou, Yuting Liu, Fang Wang, Yang Cao, Hongbin Lv, Xibo Zhang
Diagnostic Pathology.2023;[Epub] CrossRef
Giant cell-rich solitary fibrous tumour of the lacrimal gland with prominent angiomatoid cystic changes and an underlying NAB2ex3-STAT6ex18 fusion
Khaled A Alsaadi, Manar Alwohaib, Karen Pinto, Rola H Ali
BMJ Case Reports.2022; 15(2): e247141. CrossRef
Cystic appearance - a new feature of solid fibrous tumours in the lacrimal gland: a case report with literature review
Ancuta-Augustina Gheorghisan-Galateanu, Dana Cristina Terzea, Iulia Burcea, Roxana Dusceac, Cristina Capatina, Catalina Poiana
Diagnostic Pathology.2019;[Epub] CrossRef
Solitary Fibrous Tumor in the Lacrimal Gland Fossa: A Case Report
Jacqueline Mupas-Uy, Yoshiyuki Kitaguchi, Yasuhiro Takahashi, Emiko Takahashi, Hirohiko Kakizaki
Case Reports in Ophthalmology.2016; 7(2): 398. CrossRef
Ocular adnexal (orbital) solitary fibrous tumor: nuclear STAT6 expression and literature review
Aleksandra Petrovic, Aurélie Obéric, Alexandre Moulin, Mehrad Hamedani
Graefe's Archive for Clinical and Experimental Ophthalmology.2015; 253(9): 1609. CrossRef
Angiofibroma de células gigantes en mucosa yugal: una entidad rara en una localización infrecuente
Alejandro Rubio Fernández, María López Macías, Weimar Toro Zambrano, Mario Díaz Delgado, Alicia Hernández Amate
Revista Española de Patología.2014; 47(4): 223. CrossRef

Case Reports

Solitary Fibrous Tumor of the Conjunctiva with Heretofore Undescribed Pathologic Findings.: Na Rae Kim, Jae Y Ro, Kyung Hwan Shin, Hae Jung Paik, Jung Suk An, Seung Yeon Ha; Korean J Pathol. 2011;45(3):315-318.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.3.315

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A 37-year-old female presented with a conjunctival mass discovered 3 years prior. An excisional biopsy revealed a patternless proliferation of round and spindle-shaped cells with an eosinophilic fibrillary cytoplasm and vesicular nuclei with occasional inclusions. Psammoma bodies were arranged around the dilated irregularly-shaped vessels. Differential diagnoses included conjunctival solitary fibrous tumor (SFT), nevus, glomangioma, ectopic meningioma, and mesectodermal leiomyoma. The tumor cells were immunoreactive for CD34, CD99, bcl-2 and vimentin, and were negative for smooth muscle actin, desmin, glial fibrillary acidic protein, S-100 protein, epithelial membrane antigen, and human melanoma black-45. Ultrastructurally, the tumor cells had rough endoplasmic reticulum, free ribosomes, and scattered mitochondria without basal lamina or cellular junctions, which are features of fibroblasts. A diagnosis of SFT was rendered based on the light microscopic, immunohistochemical, and electron microscopic findings. We report here on the second case of a SFT arising in the conjunctiva, which clinically and histologically mimics conjunctival nevus, glomangioma, ectopic meningioma, and a hybrid neurogenic-myogenic tumor such as mesectodermal leiomyoma.

Citations

Citations to this article as recorded by

Meningeal Solitary Fibrous Tumors with Delayed Extracranial Metastasis
Nayoung Han, Hannah Kim, Soo Kee Min, Sun-Ha Paek, Chul-Kee Park, Seung-Hong Choi, U-Ri Chae, Sung-Hye Park
Journal of Pathology and Translational Medicine.2016; 50(2): 113. CrossRef

Solitary Fibrous Tumor of the Liver: A Case Report.: Hee Chul Yu, Baik Hwan Cho, Young Kon Kim, Sang Jae Noh, Woo Sung Moon; Korean J Pathol. 2010;44(5):536-539.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.5.536

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Abstract PDF

Solitary fibrous tumor is an uncommon neoplasm of mesenchymal origin that primarily affects the pleura. This tumor has been rarely found in liver parenchyma. We present an additional case of a solitary fibrous tumor in the liver of a 46-year-old woman. A contrast-enhanced magnetic resonance image revealed a well-defined round hepatic mass with strong homogeneous enhancement on arterial phase imaging. The tumor was composed of cytologically bland spindle cells with alternating hypercellular and hypocellular sclerotic areas. Immunohistochemistry indicated that the tumor cells were positive for vimentin, CD34, CD99 and smooth muscle actin, but negative for cytokeratin, human melanoma black 45, CD117, bcl-2, and S-100 protein.

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Meningeal Solitary Fibrous Tumors with Delayed Extracranial Metastasis
Nayoung Han, Hannah Kim, Soo Kee Min, Sun-Ha Paek, Chul-Kee Park, Seung-Hong Choi, U-Ri Chae, Sung-Hye Park
Journal of Pathology and Translational Medicine.2016; 50(2): 113. CrossRef

Solitary Fibrous Tumor of the Kidney: A Report of Two Cases with Review of Literature.: Sun A Kim, Jung Eun Hwang, Jae Y Ro, Kyung Ja Cho, Cheryn Song, Mi Jung Kim; Korean J Pathol. 2010;44(4):420-425.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.4.420

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Abstract PDF

Solitary fibrous tumor (SFT) is a benign mesenchymal neoplasm usually occurring in the pleura. Kidney is one of the rarest sites for SFT. We report here on two cases of renal SFT found in 30-year-old and 33-year-old men with review of the literatures. Both cases manifested as well-enhanced solid masses in kidney and radical nephrectomies were done. The tumors consisted of bland-looking spindle cells arranged in short, ill-defined fascicles and storiform pattern with characteristic hemangiopericytoma-like blood vessels. The tumor cells were strongly positive for CD34 and CD99, focally positive for bcl-2, and negative for cytokeratin and human melanoma black-45 on immunohistochemical stainings. Possibility of SFT should be considered in the differential diagnosis of a renal mass which consists of benign-looking spindle cells and hemangiopericytomatous blood vessels. Immunohistochemical staining for CD34 is essential to confirm the renal solitary fibrous tumor.

Citations

Citations to this article as recorded by

Solitary fibrous tumor located in the sella turcica: A report of two cases and review of the literature
XIAO YANG, QINGJUN JIANG, BINGBING YU
Oncology Letters.2015; 10(1): 354. CrossRef
Pediatric Renal Solitary Fibrous Tumor
William W. Wu, Julia T. Chu, Stephen G. Romansky, Lisa Shane
International Journal of Surgical Pathology.2015; 23(1): 34. CrossRef

Malignant Solitary Fibrous Tumor of the Pleura in Mediastinum.: Yun Kyung Kang, Hyun Joo Yoo, Ho Kee Yum, Hong Sup Lee; Korean J Pathol. 1997;31(4):351-356.

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Abstract PDF: Solitary fibrous tumors (SFTs) most often involve the pleura and also may encompass the peritoneum and nonserosal sites. They occur as solitary encapsulated tumors and pursue a relatively benign clinical course. The usual criteria for malignancy are high cellularity, mitotic activity (more than 4 per 10 high-power fields), cellular pleomorphism, hemorrhage and necrosis as well as infiltrative growth. We report a case of malignant SFT of pleura who presented with an anterior mediastinal mass. Grossly, it was a 10x8x6.5 cm sized, encapsulated and well-demarcated, solid neoplasm with areas of extensive necrosis. Microscopically, parallel or haphazard arrangement of spindle cells with variable degrees of collagenous background were noted. Storiform fascicle formation, hemangiopericytoma-like pattern, and epithelioid cell clusters were often intermingled. Nodular areas with high cellularity and mitotic activity (> or =10/10 HPFs) were scattered throughout the neoplasm, however no definite cellular pleomorphism was encountered. Tumor cells were immunoreactive for vimentin and CD-34, which distinguished them from the mesothelial cells. Electron microscopically, they revealed fibroblastic and myofibroblastic differentiation.

Original Articles

Extrapleural Solitary Fibrous Tumor A clinical & pathological study of 8 cases.: Mi Kyung Lee, Dong Hwan Shin, Min Sun Cho, Yuon Mee Kim, Jin Kim; Korean J Pathol. 1999;33(2):108-114.

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Abstract: We reviewed eight solitary fibrous tumors occurring at sites other than pleura (three orbit, two retroperitoneum, one each hard palate, thyroid, and tongue) which shared the histologic and immunohistochemical features of solitary fibrous tumors of pleura. Six patients were women, and two were men, aged from 26 to 74 years. The tumors ranging from 1.5 to 19 cm in diameter presented as well-circumscribed, unencapsulated, soft to rubbery tissue masses. Histologically they were characterized by a proliferation of spindle or ovoid cells intervened by a dense bundles of collagen. A variety of growth patterns was identified but the so-called patternless pattern was the predominant one. One tumor exhibited highly cellular sarcomatous areas with extensive necrosis, which was diagnosed as malignant solitary fibrous tumor. Immunohistochemical studies showed that all of the tumors were strongly positive for both CD34 and vimentin, but negative for cytokeratin, S-100 protein, EMA, and desmin. One case examined ultrastructurally showed features of fibroblast. All but one showed no evidence of recurrence or metastasis over follow-up period of 14 to 32 months. We conclude that extrapleural solitary fibrous tumors represent a distinct mesenchymal tumor with variable histologic features and should be differentiated from other spindle cell mesenchymal tumors.

Solitary Fibrous Tumor A clinicopathologic review of five cases.: Bum Kyung Kim, Dong Wook Kang, Kyeong Hee Kim, Seong Ki Min, Jin Man Kim, Kyu Sang Song, Dae Yung Kang, Si Whan Choi; Korean J Pathol. 1999;33(2):115-120.

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Abstract: We experienced five cases of solitary fibrous tumor; two in the pleura, two in the orbital soft tissue, and one in the lung parenchyma. Three patients were male, and the age of the patients ranged from 38 to 71 years (mean age: 53.6). Grossly, the masses were well circumscribed and had varying sizes from 2.5 to 30.0 cm. The cut surfaces were grayish-yellow firm with focal variegated hemorrhage, necrosis, cystic change, and myxoid area. Microscopically, these were characterized by a haphazard proliferation of spindle cells or polygonal cells separated by variable amounts of hyalinized collagen and showed a prominent vascular channels reminiscent of hemangiopericytoma in foci. Immunoperoxidase stains showed a strong reactivity for CD34, and were weakly positive for vimentin. Electron microscopical examination revealed features of fibroblast; spindle to round tumor cells were arranged in groups and surrounded by collagen. Nucleoli were seldom prominent. The cytoplasm contained many microfilaments and a moderate number of cisternae of rough endoplasmic reticulum.

Case Reports

Solitary Fibrous Tumor of the Scrotum: A case report.: Jung Weon Shim, Jae Y Ro; Korean J Pathol. 1999;33(4):295-298.

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Abstract PDF: Solitary fibrous tumor (SFT) is a rare spindle cell neoplasm that usually arises in the pleura and has been recently reported from unusual locations. We present a case of SFT that occurred in the scrotum. The patient was a 38-year-old man who presented with a painless, left, scrotal mass of five years' duration. Scrotal sonography and pelvic CT scan showed a soft-tissue mass of 11 cm in diameter. The resected tumor measured 11 8 7 cm and was well demarcated from the surrounding soft tissue. The cut surface revealed homogenously grayish-white and gelatinous appearance. No hemorrhage or necrosis was found. Microscopically, the tumor showed hypercellular spindle cell areas intermixed with hypocellular areas lying in a myxoid or collagenous stroma. The spindle cells had no mitosis or low mitotic figures, and little or no nuclear atypia. They exhibited a variety of growth patterns, including "patternless" pattern, and a prominent vasculature with hemangiopericytic pattern. Vimentin, CD34, and bcl-2 protein immunoreactivity were observed. Characteristic histologic and immunohistochemical features of this lesion were consistent with SFT. To arrive at a correct diagnosis of this lesion, especially when it occurs in unusual sites, immunohistochemical study including CD34 & bcl-2 protein is required in addition to characteristic histologic features.

Fine Needle Aspiration Cytology of Solitary Fibrous Tumor of the Pleura: Report of a case misdiagnosed as denocarcinoma of lung.: Yoon La Choi, Young Lyun Oh, Mee Sook Lee, Jung Ho Han, Geung Hwan Ahn; Korean J Cytopathol. 2001;12(2):111-115.

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Abstract PDF: Solitary fibrous tumor of the pleura is rare but should be included in the differential diagnosis of a peripheral pulmonary nodule. Cytologic features of solitary fibrous tumor of the pleura is not familar to the pathologist and may be misdiagnosed as malignancy. We report fine needle aspiration cytologic(FNAC) findings of a case of solitary fibrous tumor misdiagnosed as adenocarcinoma in a 48-year-old woman. The FNAC displayed a mixture of bland-looking spindle cells and clusters of epithelioid cells, which have hyperchromatic nuclei with prominent nucleoli. The helpful finding to distinguish it from other circumscribed benign and malignant lesions is the presence of fibromyxoid matrix admixed with blood vessels and thin collagen fibers. Familiarity with these features is essential to avoid misdiagnosis and overtreatment.

Solitary Fibrous Tumor of the Urinary Bladder: A Case Report.: Jong Sil Lee, Jeong Seok Hwa, Gyung Hyuck Ko, Jeong Hee Lee, Hwal Woong Kim; Korean J Pathol. 2004;38(2):129-131.

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Abstract PDF: Solitary fibrous tumor (SFT) most commonly affects the pleura and these tumors have been recently reported to be found in unusual locations. We describe here a solitary fibrous tumor of the urinary bladder that was removed from a 79-year-old man having a history of gross hematuria and dysuria. Transabdominal ultrasonography showed a huge soft tissue mass in the urinary bladder. The cut surface of the tumor showed a grayish-white, hemorrhagic and gelatinous appearance. Necrosis was not found. Microscopically, the tumor showed a proliferation of spindle or ovoid cells that were intervened by a collagenous stroma. A variety of growth patterns was identified but the so-called patternless pattern was the predominant one. The spindle cells had almost no mitotic figures, and there was very little or no nuclear atypia. Immunohistochemical stains showed a strong reactivity for CD34 and a focal reactivity for bcl-2. The ultrastructure of the tumor cells showed mesenchymal-myofibroblastic traits.

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