Bilobed testis

Last revised by Dr Daniel J Bell on 01 Sep 2021

Bilobed testis, also known as incomplete unilateral polyorchidism, is a very rare congenital variant in children, and considered to be an incomplete form of polyorchidism.

The exact etiology is unknown but is thought to be a form of incomplete polyorchidism. It has been proposed that bilobed testis results from the incomplete division of the urogenital ridge 1-3.

  • lobulated testis with normal echotexture
  • hemitesticular structure of similar echogenicity to that of the normal testis

The treatment depends on any underlying abnormality and the evidence is conflicting. Some papers suggest conservative management and imaging follow up (particularly if cancer suspected) 4,5. While others recommend surgical intervention of the affected testis and orchiopexy of the contralateral testis due to the significant risk of testicular torsion 6.

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