Keyhole sign (posterior urethral valves)

Dr Henry Knipe and Radswiki et al.

The keyhole sign is an ultrasonographic sign seen in boys with posterior urethral valves. It refers to the appearance of the proximal urethra (which is dilated) and an associated thick-walled distended bladder which on ultrasound may resemble a keyhole.

Article information

rID: 12802
Section: Signs
Synonyms or Alternate Spellings:
  • Key hole sign

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Photograph: keyhole
    Drag here to reorder.
  • Keyhole sign

    Case 1: posterior urethral valves
    Drag here to reorder.
  • Case 2: antenatal ultrasound
    Drag here to reorder.
  • Over-distended ur...
    Case 3
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.