Penis and scrotum

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Penis and scrotum

Inflammatory lesions

Os penis

Reviewers: Antonio Cubilla, M.D. and Alcides Chaux, M.D. (see Author/Reviewers page)

Revised: 20 February 2010, last major update February 2010

Definition

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● Heterotopic bone in penis (Eur Urol 1984;10:420), most commonly in elderly, 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)

Terminology

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● Also called baculum, penis / penile bone

Etiology

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● Penile ossification may occur after trauma (Urology 1990;35:349)

● Also associated with diabetes, gout, venereal disease, Peyronie´s disease and neoplasia

● Rarely congenital (J Urol 1964;91:663)

Clinical images

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Fig F: distal ligament (arrow) within the glans Fig C: distal ligament is composed of

penis is an aggregation of the outer type I collagen (Picrosirius red)

longitudinal layer of the tunica albuginea

and acts as a buttress for the glans penis

Raccoon Dog Walrus

Differential diagnosis

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● Ossification in the corpora cavernosa (Eur Urol 1995;27:252)

End of Penis and scrotum > Inflammatory Lesions > Os penis

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