Basal cell proliferations of the prostate other than usual basal cell hyperplasia: a clinicopathologic study of 23 cases, including four carcinomas, with a proposed classification

The American Journal of Surgical Pathology
Jesse K McKenneyRobert H Young

Abstract

Basaloid proliferations of the prostate with morphologic patterns other than usual basal cell hyperplasia are rare, and the distinction between benign and malignant lesions has been difficult. We describe 23 such lesions and classify them into two groups: adenoid cystic-like hyperplasia and adenoid cystic or basaloid carcinoma. Adenoid cystic-like hyperplasia (n = 19) was characterized by an older age at presentation (mean, 71.8 years), transition zone location with background of nodular hyperplasia, multifocality, lobulation, circumscription, and small acini with occasional hyalinization. A cribriform pattern limited to small- and medium-sized glands, squamous metaplasia, and hypercellular myxoid stroma were occasionally seen. Adenoid cystic carcinoma (n = 3) was characterized by a younger age at presentation (mean, 46.0 years), peripheral zone involvement, and large acini that were often dilated and exhibited extensive interanastomoses, prominent intraglandular hyalinization, perineural invasion, and extraprostatic extension. Basaloid carcinoma (n = 1) showed infiltration between normal glands, perineural invasion, and extraprostatic extension but lacked a cribriform architecture. The degree of cytologic atypia and mitotic ra...Continue Reading

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