Metastatic signet ring carcinoma of the breast as a source of positive cervicovaginal cytology. A case report.

The cellular manifestations of extrauterine cancer have been well documented. While finding metastatic carcinoma in gynecologic specimens should not be unexpected, descriptions of certain types of neoplasms are not well represented in the cytology literature. We describe the clinical, cytopathologic and histologic features of a case of signet ring cell breast carcinoma metastatic to the uterine cervix. Signet ring cell breast carcinoma is a rare neoplasm, and its possible histogenesis is discussed.