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Adrenal hemangioblastoma
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Case Study
Adrenal hemangioblastoma
Joo-Yeon Koo1orcid, Kyung-Hwa Lee1orcid, Joon Hyuk Choi2orcid, Ho Seok Chung3orcid, Chan Choi1orcid
Journal of Pathology and Translational Medicine 2022;56(3):161-166.
DOI: https://doi.org/10.4132/jptm.2021.12.28
Published online: February 28, 2022

1Department of Pathology, Chonnam National University Research Institute of Medical Science, Bio-Medical Sciences Graduate Program (BMSGP), Chonnam National University Hwasun Hospital and Medical School, Hwasun, Korea

2Department of Pathology, Yeungnam University Hospital, Daegu, Korea

3Department of Urology, Chonnam National University Research Institute of Medical Science, Bio-Medical Sciences Graduate Program (BMSGP), Chonnam National University Hwasun Hospital and Medical School, Hwasun, Korea

Corresponding Author: Chan Choi, MD, PhD, Department of Pathology, Chonnam National University Research Institute of Medical Science, Bio-Medical Sciences Graduate Program (BMSGP), Chonnam National University Hwasun Hospital and Medical School, 322 Seoyang-ro, Hwasun 58128, Korea, Tel: +82-61-379-7071, Fax: +82-61-379-7099, E-mail: 'cchoi@jnu.ac.kr'
• Received: December 6, 2021   • Revised: December 27, 2021   • Accepted: December 28, 2021

© 2022 The Korean Society of Pathologists/The Korean Society for Cytopathology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Hemangioblastoma (HB) is a rare benign tumor that most commonly occurs in the cerebellum. HB is composed of neoplastic stromal cells and abundant small vessels. However, the exact origin of stromal cells is controversial. Extraneural HBs have been reported in a small series, and peripheral HBs arising in the adrenal gland are extremely rare. Herein, we report a case of sporadic adrenal HB in a 54-year-old woman. The tumor was a well-circumscribed, yellow mass measuring 4.2 cm in diameter. Histologically, the tumor was composed of small blood vessels and vacuolated stromal cells with clear cytoplasm. On immunohistochemical stain, the stromal cells were positive for S-100 protein, neuron-specific enolase, and synaptophysin. The tumor did not reveal mutation of VHL alleles. We herein present a case of HB of the adrenal gland and review of the literature.
Hemangioblastoma (HB) is a rare benign tumor of the central nervous system that commonly occurs in the cerebellum. While these tumors occur sporadically in most cases, 25% of the patients with HBs are associated with von Hippel-Lindau (VHL) syndrome. Sporadic HBs generally occur in adults between 30 and 65 years of age, whereas VHL-associated tumors present in younger patients, at age 20–30 years [1]. In rare cases, HBs have been reported to occur in extraneural tissue such as the liver, lungs, pancreas, retroperitoneum, soft tissues, and kidney [25]. To the best of our knowledge, only five such cases have yet been reported in the literature (Table 1) [3,68]. Herein, we present a case of sporadic adrenal HB in a 54-year-old female patient.
An adrenal mass was incidentally detected in a 54-year-old woman during a regular medical check-up. She did not have a history of pancreatic tumor, renal tumor, or adrenal tumor. Her family members had no history of such diseases. Laboratory investigations were performed, and 24-hour urinary metanephrine (0.4 mg/day), vanillylmandelic acid (3.3 mg/day), homovanillic acid (4.1 mg/day), and 17-ketosteroid level (16.8 mg/day) were within normal limits. Plasma aldosterone concentration (PAC) was 10.5 ng/dL, plasma renin activity (PRA) was 0.42 ng/mL per hour, and PAC/PRA ratio was 25 ng/dL per ng/mL/hr. Magnetic resonance imaging revealed a 4.2 × 4.2 × 3.6 cm well-defined mass in the left adrenal gland, which was suspected to be a hemangioma (Fig. 1A). The patient underwent partial adrenalectomy. Macroscopic examination revealed that the nodular mass weighed 21 g and displayed a brown-colored cut surface with hemorrhage (Fig. 1B).
On histological examination, the tumor was well encapsulated by a fibrous wall. At low magnification, hypocellular and hypercellular area were present. The tumor was composed of abundant small blood vessels admixed with stromal cells. The blood vessels were lined by thin endothelial cells. The stromal cells had clear and vacuolated or pale eosinophilic cytoplasm (Fig. 2). Their nuclei were round to ovoid, with occasional nuclear atypia. There was no evidence of necrosis. On immunohistochemical stain, the stromal cells were positive for S-100 protein, synaptophysin, and neuron-specific enolase (NSE). The endothelial markers, CD34 and CD31, highlighted blood vessels (Fig. 3). The stromal cells were negative for inhibin-α, epithelial membrane antigen (EMA), carbonic anhydrase 9 (CA-9), CD10, glial fibrillary acidic protein (GFAP), GATA3, and chromogranin A. The tumor was diagnosed as HB based on the histological and immunohistochemical findings. The adrenal tissue surrounding the tumor was not submitted.
Targeted sequencing was performed using the ONCOaccu- Panel (NGeneBio, Seoul, Korea) which covers 323 genes. Capicua transcriptional repressor (CIC), folliculin (FLCN), fms related receptor tyrosine kinase 1 (FLT1), poly (ADP-ribose) polymerase 1 (PARP1), and polybromo 1 (PBRM1) were mutated. However, VHL was not mutated (Table 2). The patient survived with no evidence of tumor recurrence at 1-year follow-up.
HB is a rare benign tumor that generally occurs in the cerebellum in adults. In rare cases, HB has been reported to occur at extracerebellar sites. The unusual anatomical locations and histopathological features of HB may pose a diagnostic challenge. HB has been considered as a vascular neoplasm because of the histological findings of its vascular structure. However, various cell lineages such as glial (GFAP), neural (S-100 protein and NSE), vascular, endothelial (factor XIIIa), mesenchymal (vimentin), epithelial (cytokeratin), and smooth muscle/myofibroblastic (desmin and calponin) have been proposed on the bases of immunohistochemical findings [912]. Until now, their cell lineage remains unknown.
Somatic inactivation of both VHL alleles and the subsequent loss of VHL protein are found in patients with HBs and nonhereditary clear cell renal cell carcinomas (RCCs) [13]. The present case revealed wild-type VHL alleles in targeted sequencing. However, mutations of CIC, FLCN, FLT1, PARP1, and PBRM1 were found (Table 2). CIC is a member of the high-mobility-group-box superfamily of transcriptional repressors. Mutation of CIC is associated with oligodendrogliomas [14], and fusions of CIC with DUX4 (double homeobox 4) and FOXO4 (forkhead box O) genes have been reported in patients with round cell sarcomas [15]. FLCN mutation is associated with Birt-Hogg-Dubé syndrome, which is characterized by benign skin tumors, lung cysts, and kidney lesions [16]. FLT1 encodes a member of the vascular endothelial growth factor receptor family, which plays an important role in angiogenesis and vasculogenesis. PARP1 encodes poly(ADP-ribosyl)transferase, which is involved in cell differentiation, proliferation, recovery from DNA damage, and tumor transformation. PARP1 mutation is associated with Fanconi anemia [17]. PBRM1 encodes a subunit of ATP-dependent chromatin-remodeling complexes, and PBRM1 mutation is associated with clear cell RCC [18] and epithelioid sarcoma [19]. It is unclear whether these mutations are specific for HB, and further studies on these mutations in patients with HBs are needed to clarify this issue.
HB should be distinguished from their morphological mimickers, such as pheochromocytomas, perivascular epithelioid cell tumors (PEComas), other vascular tumors, and metastatic RCCs. In cases where vacuolated stromal cells are scant and prominent vascular structures are noted, HB may resemble capillary hemangioma. However, capillary hemangioma lacks vacuolated or clear stromal cells, and therefore, careful examination is necessary to make a definitive diagnosis. The distinction of RCC from adrenal HB is considered as one of the most difficult differential diagnostic challenges, because RCC can spread to the adrenal gland, and their histological findings may mimic those of HB. Usually, RCC reveals a nested architecture with thin capillaries. Immunohistochemically, RCC is positive for EMA and paired-box gene 8, and negative for inhibin-alpha and S-100 protein. Furthermore, CA-9 is a marker for clear cell RCC, which is the most common subtype of RCC. Pheochromocytoma may arise in the adrenal medulla. Because of their anatomical location and histological findings of microvascular structure and presence of some vacuolated cells, it should be considered as a differential diagnosis of HB. However, the present case did not display a Zellballen pattern, a characteristic feature of pheochromocytomas. Other histological and immunohistochemical features were not consistent with those of pheochromocytomas. PEComa is a mesenchymal tumor with perivascular epithelioid clear cells that generally develop in the kidney, uterus, and soft tissue. Primary PEComa of the adrenal gland is extremely rare and displays a nested growth pattern of epithelioid cells. PEComa typically expresses both smooth muscle and melanocytic markers such as human melanoma black 45 and Melan-A, whereas HB does not express these markers.
In summary, adrenal HB is a rare tumor, and its unusual anatomical location and histopathological features may pose a diagnostic challenge. HB should be distinguished from their morphological mimickers, such as pheochromocytoma, PEComa, other vascular tumors, and metastatic RCC. Considering the rarity of adrenal HB, we present a case report of adrenal HB to provide recommendations for its accurate diagnosis and increased awareness of this disease.

Ethics Statement

This case report was approved by the IRB of Chonnam Natinal University Hwasun Hospital (CNUHH-2021-240). Informed consent was obtained from the participant included in the study.

Availability of Data and Material

The datasets generated or analyzed during the study are available from the corresponding author on reasonable request.

Code Availability

Not applicable.

Author Contributions

Conceptualization: CC. Data curation: JYK, KHL, JHC. Investigation: JYK. Methodology: YJK, KHL, HSC. Supervision: CC. Visualization: JYK. Writing—original draft: JYK. Writing—review & editing: CC, JHC. Approval of final manuscript: all authors.

Conflicts of Interest

J.H.C., a contributing editor of the Journal of Pathology and Translational Medicine, was not involved in the editorial evaluation or decision to publish this article. All remaining authors have declared no conflicts of interest.

Funding Statement

No funding to declare.

Fig. 1
(A) Magnetic resonance imaging reveals a 4.2 × 3.6 × 4.2 cm mass in the left adrenal gland. (B) Gross examination shows an encapsulated nodular mass.
jptm-2021-12-28f1.jpg
Fig. 2
The tumor is encapsulated by a fibrous wall (A) and is composed of alternating hypercellular and hypocellular areas (B). Vascular structures with vacuolated stromal cells (C, D) are observed.
jptm-2021-12-28f2.jpg
Fig. 3
Immunohistochemical staining shows that the vascular endothelial cells are positive for CD31 (A). The stromal cells are positive for NSE (B), S-100 protein (C), and synaptophysin (D). However, they are negative for chromogranin A (E) and GATA3 (F).
jptm-2021-12-28f3.jpg
Table 1
Reported cases of hemangioblastoma of the adrenal gland in the literature
Case Age (yr)/Sex Clinical feature Size/Weight Microscopic findings Immunohistochemical or special stain/EM Association with VHL syndrome Follow-up
Burns et al. (1987) [6] 23/F Erythrocytosis (hematocrit, 58%) 5.0 cm Abundant thin-walled blood vessels; stromal cells, large cells with vacuolated clear cytoplasm Stromal cell with fat vacuole Yes NA
Itoh et. al. (1988) [7] 49/M Incidentally found; elevated noradrenalin (187.4 μg/day) and dopamine (2,308 μg/day) in urine 2.7 cm Abundant capillary structures; stromal cells, large ovoid NSE (+), fat stain (+) No NA
Nonaka et al. (2007) [3] 30/F Cerebellar and spinal HB, bilateral adrenal HB 0.9 cm; 0.5 cm Focal cavernous vascular spaces; stromal cells, vacuolated large with amphophilic cytoplasm, round to oval nuclei S-100 protein (+, focal), chromogranin (+), CD31 (−), CD34 (−) Yes NA
Browning and Parker (2008) [8] 30/M Bilateral adrenal HB, spinal and cerebellar HB, pancreatic and renal cysts, cystic renal cell carcinoma (suspicious) Not identified (12.5 g; 8.3 g) Abundant capillaries; stromal spindled cells. Stromal cells; large, intimately connected with vascular walls Chromogranin (+), vimentin (+), S-100 protein (−) Yes NA
Current case 54/F Incidentally found 4.2 cm Abundant capillaries; stromal cells, vacuolated or amphophilic cytoplasm CD34 (−), CD31 (−), inhibin-alpha (−), EMA (−), CK (−), CA-9 (−), CD10 (−), S-100 protein (+), synaptophysin (+), NSE (+) No Alive (1 yr)

EM, electron microscopy; VHL, von Hippel-Lindau; F, female; NA, not available; M, male; NSE, neuron-specific enolase; HB, hemangioblastoma; EMA, epithelial membrane antigen; CK, cytokeratin; CA-9, carbonic anhydrase 9.

Table 2
The mutated genes found in the targeted sequencing
Gene symbol RefSeq Amino acid Nucleotide No. of variants/Total VAF (%)
CIC NM_015125.3 Pro911Gln 2732C>A 160/365 43.84
FLCN NM_144997.5 Ser575Leu 1724C>T 165/347 47.55
FLT1 NM_002019.4 Ala673Val 2018C>T 348/734 47.41
PARP1 NM_001618.3 Val991Ala 2972T>C 297/555 53.51

RefSeq, Reference sequence; VAF, variant allele frequency.

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