Solid variant of mammary adenoid cystic carcinoma with basaloid features: a study of nine cases

The American Journal of Surgical Pathology
Sandra J Shin, Paul Peter Rosen

Abstract

Adenoid cystic carcinoma of the breast is a rare neoplasm that represents <1% of breast carcinomas. The tumors are histologically indistinguishable from examples in other sites, and they have a generally favorable prognosis. Several studies have investigated the possible correlation between histologic grade in adenoid cystic carcinoma (largely determined by cytology and growth pattern) and prognosis. Some earlier reports concluded that a solid variant of mammary adenoid cystic carcinoma had a more aggressive clinical course, but others did not confirm this impression. This report describes nine patients with a solid variant of mammary adenoid cystic carcinoma that has a striking basaloid appearance. All were women ranging in age from 37 to 83 years. A solitary mass was evident in all patients. Tumor size was 1.1-15 cm (mean 3.7 cm). The tumors exhibited a predominantly solid architecture comprised of basaloid appearing cells with moderate to marked nuclear atypia. Five tumors had >5 mitotic figures per 10 high power microscopic fields. Intercalated ducts were found in all tumors, being well formed in six and poorly formed in three. Immunohistochemical stains for cytokeratins, basement membranes, and vimentin were consistently p...Continue Reading

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