Fine needle aspiration cytology of tubular adenoma of the breast. A report of two cases.

During the routine practice of fine needle aspiration of the breast, two tubular adenomas were encountered. The patients were 46 and 69 years of age. In one case the appearances indicated a benign epithelial proliferative lesion, while in the other, epithelial atypia necessitated surgical excision. The differential diagnoses included other benign epithelial proliferative lesions and carcinoma. To avoid inappropriate surgery, the cytomorphologic spectrum of benign epithelial proliferative lesions, including tubular adenoma, must be recognized.