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 (which is dilated) and associated thick walled distended bladder which on ultrasound may resemble a key hole.

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Article information

rID: 12802
Section: Signs
Synonyms or Alternate Spellings:

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Cases and figures

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    Image courtesy of...
    Figure 1: keyhole photo
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    Keyhole sign

    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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