Testis & paratestis

General

WHO classification


Editorial Board Member: Bonnie Choy, M.D.
Debra L. Zynger, M.D.

Last staff update: 22 November 2022 (update in progress)

Copyright: 2002-2022, PathologyOutlines.com, Inc.

PubMed Search: Testis tumors WHO classification

Debra L. Zynger, M.D.
Page views in 2021: 7,039
Page views in 2022 to date: 7,399
Cite this page: Zynger DL. WHO classification. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/testistestclassif.html. Accessed December 9th, 2022.
Definition / general
  • WHO classification of tumors of the urinary and male genital tumors
  • Currently on 5th edition, published in 2022
Major updates
  • Germ cell tumors derived from germ cell neoplasia in situ:
    • Teratoma with primitive neuroectodermal tumor (PNET) is now called teratoma with embryonic type neuroendocrine differentiation
  • Sex cord stromal tumors:
    • Signet ring pattern of Sertoli cell tumor is now listed as a separate tumor called signet ring stromal tumor
    • Myoid gonadal stromal tumor changed from a provisional entity to a confirmed entity
  • Paratesticular mesothelial tumors:
    • Well differentiated papillary mesothelioma was renamed well differentiated papillary mesothelial tumor
WHO (2022)
Germ cell tumors derived from germ cell neoplasia in situ
Germ cell tumors unrelated to germ cell neoplasia in situ
Sex cord stromal tumors
Ovarian type tumors of the collecting ducts and rete testis
Tumors of collecting duct and rete testis
Paratesticular mesothelial tumors
Tumors of the epididymis
Metastatic tumors
Board review style question #1

Spermatocytic tumor, shown in the image above, is an example of which of the following categories of testicular tumors?

  1. Germ cell tumors derived from germ cell neoplasia in situ
  2. Germ cell tumors unrelated to germ cell neoplasia in situ
  3. Sex cord stromal tumors
  4. Tumor containing both germ cell and sex cord stromal elements
Board review style answer #1
B. Germ cell tumors unrelated to germ cell neoplasia in situ

Comment Here

Reference: Testis & paratestis - WHO classification
Board review style question #2

Seminoma, shown in the image above, is an example of which of the following categories of testicular tumors?

  1. Germ cell tumors derived from germ cell neoplasia in situ
  2. Germ cell tumors unrelated to germ cell neoplasia in situ
  3. Sex cord stromal tumors
  4. Tumor containing both germ cell and sex cord stromal elements
Board review style answer #2
A. Germ cell tumors derived from germ cell neoplasia in situ

Comment Here

Reference: Testis & paratestis - WHO classification
Back to top
Image 01 Image 02