ArticleVeterinary research communications2026
Noninvasive malignant mammary adenomyoepithelioma in a male cat.
Article in Veterinary research communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This report describes the histopathological and immunohistochemical findings of a noninvasive malignant mammary adenomyoepithelioma in a seven-year-old neutered male mixed-breed cat. The animal was euthanized due to an extensive mandibular fracture caused by squamous cell carcinoma. Macroscopically, a 3 × 1.5 cm, elevated, well-defined, ulcerated, lobulated, reddish-white, solid - occasionally cystic - and firm nodule was observed in the right inguinal mammary gland. Microscopically, an expansive neoplastic proliferation composed of myoepithelial and epithelial cells arranged predominantly in a papillary pattern was observed. Immunohistochemistry was performed for the markers C-Kit, pan-cytokeratin (CK-AE1/AE3), cytokeratin 7 (CK7), P63, estrogen receptor (ER), progesterone receptor (PR), Ki67, cyclooxygenase-2 (Cox-2), and GATA3. The neoplastic cells were positive for CK AE1/AE3 and 7 (epithelial cells), P63 (myoepithelial cells), Cox-2 (epithelial and myoepithelial cells), and PR (epithelial cells). Positive results for CK-AE1/AE3, CK7, and P63 confirmed the epithelial and myoepithelial nature of the tumor, the mitotic index and elevated Ki-67 expression supported the interpretation of a malignant proliferative phenotype and contributed to the classification of the lesion as a noninvasive malignant adenomyoepithelioma. Based on the macroscopic, microscopic, and immunohistochemical findings, a diagnosis of noninvasive malignant mammary adenomyoepithelioma was established.
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