Vasitis Nodosa and Related Lesions: A Modern Immunohistochemical Staining Profile with Special Emphasis on Novel Diagnostic Dilemmas

Vasitis nodosa is a benign proliferation of vas deferens epithelium, thought to be a response to trauma or obstruction, usually vasectomy. Although histologic features mimic malignancy, diagnosis is usually straightforward due to the clinical context. We analyzed 21 specimens with vasitis or epididymitis nodosa with antibodies to PAX8, CD10, p63, alpha-methyl-acyl-coA-racemase (AMACR), GATA3, prostein, NKX3.1, and prostate-specific antigen (PSA). Two diagnostically problematic cases included 1) florid bladder muscle involvement after prostatectomy and 2) involvement of the ampulla and ejaculatory duct in a radical prostatectomy specimen.

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