title: Primary signet ring cell carcinoma of the breast.
abstract: Three examples of primary signet ring cell carcinoma of the breast are described. This form of breast carcinoma deserves recognition as an entity because its prognosis may differ from colloid carcinoma of the breast and because of potential difficulty in distinguishing it from metastatic carcinoma.
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000473:pathology*; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D011379:Prognosis