TFE3-expressing malignant perivascular epithelioid cell tumor of the mesentery: A case report and review of literature
| Autor: | Jong Hee Nam, U Chul Ju, Ji Shin Lee, Yoo Duk Choi, Nah Ihm Kim |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Pathology
medicine.medical_specialty Histology business.industry TFE3 General Medicine Perivascular Epithelioid Cell 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Perivascular epithelioid cell tumor hemic and lymphatic diseases 030220 oncology & carcinogenesis Case report medicine Differential diagnosis Mesentery 030211 gastroenterology & hepatology business |
| Zdroj: | World Journal of Clinical Cases |
| ISSN: | 2307-8960 |
| DOI: | 10.12998/wjcc.v8.i18.4207 |
| Popis: | BACKGROUND Perivascular epithelioid cell tumor (PEComa) is a rare mesenchymal tumor that exhibits an epithelioid and spindle cell morphology. The tumor is characterized by immunoreactivity for melanocytic and myogenic markers but can be misdiagnosed as more common tumors with similar characteristics, including gastrointestinal stroma tumors or leiomyosarcomas. Recently, a subset of PEComas has been reported to harbor a transcription factor binding to TFE3 fusion. Herein, we report a rare case of TFE3-expressing malignant PEComa arising from the mesentery. CASE SUMMARY A 50-year-old woman presented with abdominal discomfort for 3 months. Results of laboratory tests were all within the normal ranges, and the patient had no notable medical history. Magnetic resonance imaging revealed a large tumor on the right side of the pelvic floor, which was originally suspected to be a primary ovarian tumor. However, during surgery, the tumor was revealed to have originated from the mesentery. Histologically, the tumor was composed of bundles of spindle cells and sheets of epithelioid cells. Extensive coagulative necrosis and numerous mitotic figures were observed. Immunohistochemistry revealed that the tumor cells were positive for smooth muscle actin, HMB-45, and TFE3 expression. Tumor involvement of the rectal serosa was identified, leading to a final diagnosis of malignant PEComa of the mesentery. Surgical resection was followed by adjuvant chemotherapy. No recurrence or metastasis was observed over a 6-month follow-up period. CONCLUSION Malignant PEComa of the mesentery is extremely rare and should be distinguished from morphological mimics through differential diagnosis and immunohistochemistry. |
| Databáze: | OpenAIRE |
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