Cystic hypersecretory duct carcinoma of the breast. Report of a case with fine-needle aspiration.

A patient with a recently described rare histologic variant of ductal carcinoma of the breast, so-called cystic hypersecretory duct carcinoma, is described. The findings on fine-needle aspiration biopsy, and to our knowledge, the first cytologic study of this entity reported in the literature, are described and differentiated from mucinous carcinoma and benign mucocelelike lesions. The histologic differential diagnosis, with an emphasis on benign lesions that may have a predominant cystic component, is also discussed.