Keyhole sign (posterior urethral valves)

Dr Dan J Bell 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.

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Article information

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

Cases and figures

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    Photograph: keyhole
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    Keyhole sign

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    Case 1: posterior urethral valves
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    Case 2: antenatal ultrasound
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    Over-distended ur...
    Case 3
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