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Gastric Langerhans Cell Histiocytosis: Case Report and Review of the Literature
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Brief Case Report
Gastric Langerhans Cell Histiocytosis: Case Report and Review of the Literature
So Jung Lee1,2, Chung Su Hwang1,2, Gi Young Huh1,2, Chang Hun Lee1,2, Do Youn Park,1,2
Journal of Pathology and Translational Medicine 2015;49(5):421-423.
DOI: https://doi.org/10.4132/jptm.2015.05.19
Published online: June 9, 2015

1Department of Pathology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea

2Biomedical Research Institute, Pusan National University Hospital, Busan, Korea

Corresponding Author Do Youn Park, MD, PhD Department of Pathology, Pusan National University Hospital, Pusan National University School of Medicine, 179 Gudeok-ro, Seo-gu, Busan 49241, Korea Tel: +82-51-240-7422, Fax: +82-51-242-7422, E-mail: 'pdy220@pusan.ac.kr'
• Received: February 3, 2015   • Revised: May 4, 2015   • Accepted: May 19, 2015

© 2015 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 (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Langerhans cell histiocytosis (LCH) is a rare disease of unknown etiology and is characterized by a clonal proliferation of Langerhans cells [1]. The clinical presentation of LCH is variable, ranging from single organ to multisystem involvement; patients may experience benign to life-threatening outcomes [1]. Localization of LCH to the stomach is extremely rare and is most often found in pediatric patients with systemic disease [2]. Here we present a case of localized LCH to the stomach in a 64-year-old man who underwent a complete resection of the lesion by endoscopic submucosal dissection (ESD).
A 64-year-old man was referred to a gastroenterologist for further evaluation of an abnormality found during an upper gastrointestinal examination. This patient had nothing remarkable in his medical history except medical treatment for hyperthyroidism. Esophagogastroduodenoscopy revealed an elevated mucosal lesion approximately 1 cm in size in the gastric fundus (Fig. 1A). The surface of the lesion was smooth with focal erosion. Microscopic examination of the endoscopic biopsy specimen revealed increased eosinophilia, and a cluster of histiocytic cells infiltrated the lamina propria and were mixed with lymphocytes, neutrophils, and plasma cells (Fig. 1C). The histiocytic cells had elongated nuclei, intranuclear grooves, and irregular nuclear membranes, as well as abundant fine granular eosinophilic to clear cytoplasm. Histiocytic cell clusters showed strong immunoreactivity to S100 and CD1a (Fig. 1D), while they were negative to cytokeratin AE1/AE3 and leukocyte common antigen. Through a combination of morphological and immunohistochemical analyses, a diagnosis of LCH was confirmed. A gastroenterologist performed ESD for complete removal of the lesion. The ESD specimen showed a very focal remnant LCH lesion that had been completely removed (Fig. 1B). Following complete resection of the gastric LCH lesion, a comprehensive evaluation was performed to determine the extent of the disease. No evidence of multisystem involvement was found. The patient’s 6-month follow-up visit revealed no local or systemic recurrence, and the patient remained in good health.
LCH is a rare disease identified in both children and adults and is characterized by infiltration of histiocytic cells in various organs [3]. The pathogenesis and etiology of LCH are not fully understood [1]. A recent hypothesis suggests that LCH cells are derived from bone marrow monocyte precursors that differentiate into antigen-presenting cells (i.e., Langerhans cells or dendritic cells) in the epidermis, respiratory tract, and lymph nodes. The presence of monoclonality itself has been used as evidence that this disease is a clonal neoplastic disorder. Despite the neoplastic nature of the condition, the clinical course of LCH is heterogeneous. Therefore, treatment of LCH depends on the extent and severity of the disease at the time of diagnosis, which includes the number of involved organs and the presence of normal organ function [1].
Involvement of the gastrointestinal tract is very rare and has been associated with systemic involvement and poor prognosis [4]. In pediatric patients, LCH in the gastrointestinal tract produces symptoms such as vomiting, loose stool, and abdominal pain and is related to a poor prognosis in the majority of neonatal cases; in these patients, skin lesions usually precede gastrointestinal LCH [4,5]. In contrast to children, adult patients are asymptomatic and present with solitary polypoids or elevated lesions [4]. Only six cases in adult of gastric LCH have been reported in the literature [4,6-10]. In contrast to pediatric LCH, adult gastric LCH appears as a unifocal disease without recurrence or progression, in a similar manner to our case (Table 1). Like many other gastric LCH cases, an elevated mucosal lesion was noted in our patient by the gastroenterologist, whose initial impression was a submucosal tumor. Endoscopic findings of gastric LCH mucosa are sometimes confused with gastric tumors presenting as polypoids and ulcerative mucosa [2,4]. Despite the absence of clinical features, gastric LCH shows the typical histological characteristics of LCH in other organs [3,4]. Histologically, histiocytic cells resemble Langerhans cells of the epidermis. Langerhans cell form a sheet of islands with indistinct cell borders and abundant eosinophilic cytoplasm. Their nuclei are elongated and irregular, exhibiting vesicular chromatin with a nuclear groove and often presenting with a single prominent nucleoli [3,4]. Langerhans cells are usually mixed with other inflammatory cells such as eosinophils, lymphocytes, plasma cells, and neutrophils. In the literature, predominant eosinophil infiltration has been reported in 50% of cases with gastric LCH [4]. In a similar manner to a previous report [4], our case showed aggregates of histiocytic cells with Langerhans cell nuclear features, which were mixed with inflammatory cells, mainly eosinophils. Immunohistochemical analysis is helpful to confirm the diagnosis, and Langerhans cells show diffuse immunoreactivity for S100 and CD1a [1,4]. In such cases, we suggest that stomach LCH could appear as a submucosal tumor upon endoscopy. Pathologists should consider the possibility of LCH if microscopic observation of biopsy specimens reveals increased eosinophilia or histiocytic cells. In these cases, immunohistochemical staining for S100 and CD1a is needed.

Conflicts of Interest

No potential conflict of interest relevant to this article was reported.

This work was supported by the year 2014 clinical research grant from Pusan National University Hospital.
Fig. 1.
Endoscopic and histologic finding of gastric Langerhans cell histiocytosis. (A) A mild elevated mucosal lesion (1 cm in size) with central erosion is observed upon gastroenteroscopy (circle). The lesion is located in the fundus of the stomach. (B) Microscopic analysis of the endoscopic submucosal dissection specimen. Focal histiocytic cell aggregates are present in the lamina propria and muscularis mucosa, with abundant eosinophils and other inflammatory cells. (C) Microscopic analysis of the endoscopic biopsy specimen reveals histiocytic cell aggregates in the lamina propria of the mucosa, with abundant eosinophil infiltration. Lymphocytes and plasma cells are also observed. The histiocytic cells show an irregular nuclear membrane and groove. These cells have abundant and granular eosinophilic to clear cytoplasm. (D) Immunohistochemistry for CD1a. The histiocytic cells show positive staining for CD1a.
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Table 1.
Comparison of reported cases and presented case
Case no. Reference Age (yr)/Sex Symptom Endoscopic finding Site Multiplicity Specimen Multisystema Outcomes Follow-up
1 Singhi and Montgomery [4] 68/M Dysphasia Polyp Antrum Solitary Biopsy Absent Remission 22 mo
2 Iwafuchi et al. [6] 49/F Asymptomatic Sessile elevation Throughout the stomach Multiple Biopsy Absent Remission 5.6 yr
3 Nihei et al. [7] 47/F R/O cancer Flat Body Solitary Resection Absent Remission 20 mo
4 Vazquez and Ayestaran [8] 59/F Epigastric pain Ulcer Lesser curvature Solitary Resection N/A N/A N/A
5 Lee et al. [9] 51/M Asymptomatic Elevated Antrum Solitary Biopsy, ESD Absent Remission 12 mo
6 Wada et al. [10] 53/F Abdominal discomfort Polypoid Throughout the stomach Multiple Biopsy Absent Alive/skin lesion developed 2 yr
7 Present case 64/M Asymptomatic Elevated Fundus Solitary Biopsy, ESD Absent Remission 6 mo

M, male; F, female; R/O, rule out; N/A, not applicable; ESD, endoscopic submucosal dissection.

a Multisystem involvement at diagnosis.

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