Keyhole sign

Keyhole sign Rotated image of an antenatal ultrasound of the foetal pelvis demonstrating the keyhole sign, created by the distend bladder and posterior urethra.
Modality: Ultrasound

- “ Ultrasound demonstrates a markedly distended bladder and prostatic urethra (keyhole sign) with a degree of prominence of the renal collecting syst...”

Used in the following article:

  • Keyhole sign (posterior urethral valves) - “ The keyhole sign is an ultrasonographic sign seen in boys with posterior urethral valves. It refers to the appearance of the proximal urethra (whi...”

View full size version of Posterior urethral valves

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