Tubular adenoma of the breast is a rare benign tumor with cytological findings similar to those of fibroadenoma. We report a case of tubular adenoma of the mammary gland in a 23-year-old female, with emphasis on the cytological findings. The cytological smears show abundant benign bimodal ductal cells arranged mainly in tubular structures as in pericanalicular fibroadenoma, and also small amounts of condensed secretions in the ductal lumen or in the background. Such secretions may be one of the important findings for the differential diagnosis between fibroadenoma and tubular adenoma of the breast by fine needle aspiration cytology.
We report herein on a case of malignant deciduoid mesothelioma arising in the peritoneum. A 74-year-old man was found to have ascites. Cytological examination of the ascites revealed large atypical oval cells with rich cytoplasm. The nucleus, single or multinucleated, was located at the center of the cell, and showed coarse granular chromatin and several nucleoli. Malignant mesothelioma was suspected from these findings. From the subsequent peritoneal biopsy, the tumor was diagnosed as a malignant deciduoid mesothelioma. Immunohistochemical and electron microscopic examinations confirmed the mesothelial characteristics of the tumor cells. Cytological findings of this rare variant of a malignant mesothelioma are shown for diagnostic purposes.