Contributor: Gordon K. Klintworth
Lobular carcinoma is one variety of breast carcinoma [carcinoma - breast]. This tumor accounts for ~15% of all breast carcinomas. The carcinoma  has a relatively good prognosis with a 10 year surval of 90%, but the carcinoma frequently relapses after a 10 year disease free period. The lobular carcinoma of the breast is divided into a classical infiltrating lobular carcinoma and other subtypes (solid, alveolar, mixed, and pleomorphic). This tumor is commonly associated with involvement of both breasts. The tumor cells often infiltrate in single files and the tumor cells often resemble signet rings.