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Case of the Week

2020-18 / May 4 (Contributor: Stephen Rohan)

The patient in his 40s presented with a complaint of a right testicular mass. Ultrasound revealed a 2.0 cm cystic mass. Serum tumor markers (HCG, AFP, LDH) were all normal. Positive immunohistochemical stains are shown. Additional stains performed (all negative) included CK5/6, calretinin, and OCT4.

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5 photo(s) Updated on: May 01, 2020


1. What is the correct diagnosis?

   a. Mesothelial hyperplasia

   b. Malignant mesothelioma

   c. Serous borderline tumor / atypical proliferative serous tumor of the para-testis

   d. Metastatic carcinoma

   e. Embryonal carcinoma

About GUPS

The Genitourinary Pathology Society (GUPS) was formed with the vision of advancing the care of patients with urologic diseases through enhancements of best practices, research, and education in the subspecialty of Urological Pathology.

GUPS is an official Companion Society of the United States and Canadian Academy of Pathology (USCAP).



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