Uterine plexiform tumourlets: multifocal and solitary cases with subsets expressing melanocytic markers
| Autor: | Joseph T. Rabban, Colin J.R. Stewart, Michael Texler, Yee Jia Chua, W. Glenn McCluggage |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Adult Pathology medicine.medical_specialty Histology Perivascular Epithelioid Cell Neoplasms TFE3 Biology Perivascular Epithelioid Cell Pathology and Forensic Medicine Diagnosis Differential 03 medical and health sciences Cytokeratin 0302 clinical medicine Leiomyomatosis Atypia medicine Biomarkers Tumor Humans In Situ Hybridization Fluorescence Melanins integumentary system Epithelioid Cells Uterus General Medicine Middle Aged medicine.disease Immunohistochemistry 030104 developmental biology 030220 oncology & carcinogenesis Uterine Neoplasms Desmin Female sense organs Epithelioid cell |
| Zdroj: | HistopathologyReferences. 78(5) |
| ISSN: | 1365-2559 |
| Popis: | Aims Uterine plexiform tumourlets are traditionally regarded as microscopic epithelioid leiomyomas. They are typically solitary incidental findings, but may be multifocal (plexiform leiomyomatosis). We aim to report novel immunohistochemical and morphological findings, specifically the presence of spindled and epithelioid cell nodules, in these lesions. Methods and results Three cases of plexiform leiomyomatosis and 16 solitary plexiform tumourlets were included. Two cases of plexiform leiomyomatosis and four solitary plexiform tumourlets demonstrated spindled and epithelioid cell nodules which, in one of the former cases, formed expansile masses up to 15 mm. The nodules demonstrated mild cytological atypia and occasional mitotic activity, and they were associated with a myxoid stroma and a lymphohistiocytic infiltrate which imparted a granulomatous appearance to the microscopic lesions. The plexiform tumourlets (solitary and multifocal) consistently expressed desmin, smooth muscle actin, ER and PR, and they commonly co-expressed melanocytic and perivascular epithelioid cell (PEC) markers HMB45, MiTF and cathepsin K. The spindled and epithelioid cell nodules were generally negative for myoid markers and hormone receptors, but expressed p16, cyclin D1 and TFE3. All lesions tested were negative for cytokeratin, S100, melanA, inhibin, EMA, ALK and BCOR; fluorescence in-situ hybridisation was negative for ALK, TFE3 and BCOR rearrangements in one of the larger spindled and epithelioid cell nodules. Conclusions Plexiform tumourlets commonly co-express myoid and melanocytic markers and may represent part of the spectrum of gynaecological PEC-related lesions. Some cases are associated with spindled and epithelioid cell nodules that could potentially mimic other uterine myxoid neoplasms. |
| Databáze: | OpenAIRE |
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