Epididymal cribriform hyperplasia. A variant of normal epididymal histology.

We describe a case of orchiectomy for testicular germ cell neoplasm with a peculiar associated cribriform hyperplasia of the epididymis. The process, which we have termed epididymal cribriform hyperplasia (ECH), is tantalizingly akin to patterns of cribriform ductal carcinoma in situ of the female breast and is characterized by complex arcades and cellular bridges spanning dilated epididymal lumina. The cells lining these interconnecting arches have hyperchromatic nuclei, but lack significant atypia or mitotic activity. A limited search of the Vanderbilt University Medical Center (Nashville, Tenn) surgical pathology files produced 30 cases with evaluable epididymis, 15 of which had some degree of ECH. The ECH occurred in a broad age range with a mean of 40 years. No association of ECH with testicular germ cell neoplasia, adenomatous hyperplasia of the rete testis, or parenchymal atrophy could be documented. We conclude that ECH is a seldom recognized variant of normal epididymal histologic appearance that may be present in up to half of epididymides.