Penis and scrotum
Inflammatory lesions
Os penis

Authors: Antonio Cubilla, M.D., Alcides Chaux, M.D. (see Authors page)

Revised: 30 March 2018, last major update February 2010

Copyright: (c) 2002-2018,, Inc.

PubMed Search: Os penis[TIAB]

Cite this page: Cubilla, A., Chaux, A. Os penis. website. Accessed December 15th, 2018.
Definition / general
  • Heterotopic bone in penis (Eur Urol 1984;10:420), most commonly in elderly and also children
  • Note: male mammals except chimpanzees and humans have an intrapenile bone (bacula); humans have an equivalent strong distal ligament composed of type I collagen in the glans (J Androl 2005;26:624)
  • Also called baculum, penis / penile bone
  • Penile ossification may occur after trauma (Urology 1990;35:349)
  • Also associated with diabetes, gout, venereal disease, Peyronie disease and neoplasia
  • Rarely congenital (J Urol 1964;91:663)
Clinical images

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Figure F

Microscopic (histologic) images

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Figure C

Differential diagnosis