Pleomorphic adenoma of the lacrimal gland: atypical location of a salivary tumor
Keywords:
lacrimal gland, pleomorphic adenoma, histopathology, immunohistochemistryAbstract
Introduction: In daily ophthalmological practice, lacrimal gland tumors are rare. They represent 5 to 7.5% of all intraorbital tumors. The most common epithelial tumor of this gland is the pleomorphic adenoma, with a percentage of 25 to 50% of its tumor lesions.
Objective: In this communication we presented a case of lacrimal gland pleomorphic adenoma and study the expression of Ki67 and the location and expression of MUC-1 and its correlation with tumor prognosis. We also carried out a retrospective descriptive study of the literature on the subject published between 1951 and 2020, using the MEDLINE database. Material and methods: The surgical piece examined, was processed according to the paraffin embedding technique, was performed with a histopathological diagnosis of pleomorphic lacrimal gland adenoma. Histological sections were stained with Hematoxylin / Eosin. Immunostaining with Ki67 and MUC-1 was performed with the DAKO LSAB + kit. Results: The diagnosis of hypercellular pleomorphic adenoma with areas of the remaining lacrimal gland was made. Ki67 labeling was low (≤15%). MUC-1 expression was intense, situated to the apical cell membrane of approximately 10% epitheliocytes from pseudoductal and cystic structures.Conclusions: Through histopathological evaluation, the correlation of Ki67 expression and the location and expression of MUC1, we verified that it is a non-recurrent pleomorphic adenoma without malignant transformation.
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