Cytodiagnosis of papillary carcinoma of the male breast: Report of a case with histological correlation.

Papillary lesions of the breast pose great diagnostic challenges on fine needle aspiration cytology (FNAC) due to overlapping features between benign and malignant entities. Preoperative cytodiagnosis is difficult. We present a case of a 52-year-old male who presented with a progressively increasing firm swelling in the left breast for 3 years. The nipple was eroded with ulceration and bleeding. Ultrasonography (USG) revealed a mass measuring 2.9 cm × 1.5 cm in the left breast. FNAC smears were hypercellular with ductal cells arranged in papillae and glandular clusters. At places, the cells had irregular nuclear membrane, prominent nucleoli, fine chromatin, scanty-to-moderate cytoplasm, and high nuclear-cytoplasmic ratio with pleomorphism. Histopathology of the excised swelling was consistent with intracystic papillary carcinoma (IPC) supported with immunohistochemistry markers. The case is being presented due to its rarity.