Lobular Carcinoma In Situ of the Breast Presenting as a Mass

Stein LF, Zisman G, Rapelyea JA, Schwartz AM, Abell B, Brem RF oote and Stewart [1] described lobular carcinoma in situ (LCIS) as a distinct pathologic entity in 1941. Historically, it has been considered an incidental finding in breast tissue, often adjacent to the area of abnormality that prompts biopsy. It was previously thought to lack any corollary signs of mass or calcification on mammogram [2, 3]. Recent studies indicate that LCIS foci may contain specific microcalcifications [3, 4], but to our knowledge, there is no report of LCIS forming a solid mass. We report a case of LCIS that presented as a focal mass.