Home Education AUAUniversity Education Products & Resources Pathology for Urologists Penis Congenital/Anatomical Defects Diphallus and Aphallia

Diphallus and Aphallia

Image A

Image B


  • Duplication of the penis.
  • Rare anomaly that may range from small accessory penis to the real deal – times two (image A).
  • Associated anomalies: hypospadias, bifid scrotum, duplicated bladder, renal agenesis/ ectopia, etc.

Aphallia (penile agenesis)

  • Results from failure of the genital tubercle to develop.
  • Incidence: 1/10,000,000 live male births (only 70 reported cases).
  • Usually has appearance of well-developed scrotum with bilaterally descended testes, but no penile shaft (image B).
  • Urethral opening most often on the anal verge adjacent to a small skin tag; otherwise, may be in rectum.
  • Associated anomalies: cryptorchidism, horseshoe kidney, renal agenesis, imperforate anus, etc.