Testis & epididymis


Klinefelter syndrome

Topic Completed: 1 September 2012

Minor changes: 8 September 2020

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PubMed Search: Klinefelter syndrome [title] infertility

Turki Al-Hussain, M.D.
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Cite this page: Al-Hussain T. Klinefelter syndrome. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/testisklinefelter.html. Accessed November 27th, 2021.
Definition / general
  • 47XXY, reduced body and pubic hair, gynecomastia in 40 - 80%, high FSH, variable LH
  • Increased risk of breast cancer and extragonadal germ cell tumor
Gross description
  • Small, firm testes
Microscopic (histologic) description
  • Reduced number of intratubular germ cells, some tubules are Sertoli cell only
  • Also tubular sclerosis, Leydig cell nodules (appear hyperplastic due to tubular atrophy), focal spermatogenesis rarely seen
Electron microscopy description
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