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...”

View full size version of Posterior urethral valves

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