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  1. radiopaedia.org › articles › posterior-urethral-valvesPosterior urethral valves | Radiology Reference Article -...

    Aug 20, 2024 · Posterior urethral valves are congenital obstructive lesions of the urethra that cause bladder distention, hydronephrosis and renal dysplasia. Ultrasound may show the keyhole sign, a dilated and elongated posterior urethra, and VCUG may show a linear radiolucent band and vesicoureteral reflux.

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    • Keyhole sign (posterior urethral valves) | Radiology Reference Article ...
    • Keyhole sign. a Schematic explanation of the keyhole sign shows the ...
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  3. radiopaedia.org › articles › keyhole-sign-posterior-urethralKeyhole sign (posterior urethral valves) - Radiopaedia.org

    Oct 9, 2023 · 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.

  4. radiologykey.com › posterior-urethral-valvesPosterior Urethral Valves - Radiology Key

    Jul 7, 2019 · Learn about the US findings of posterior urethral valves, the most common cause of fetal bladder outlet obstruction. The keyhole sign is the dilatation of the proximal urethra anterior to the bladder, which indicates the obstruction.

  5. radiopaedia.org › articles › keyhole-sign-posterior-urethralRadiopaedia.org

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  6. obgyn.onlinelibrary.wiley.com › doi › fullKeyhole sign: how specific is it for the diagnosis of posterior...

    Jul 29, 2009 · The ‘keyhole sign’, representing a dilatation of the posterior urethra in patients with posterior urethral obstruction 10, is thought to be a very specific sign of PUV.

  7. www.ncbi.nlm.nih.gov › books › nPosterior Urethral Valve - StatPearls - NCBI Bookshelf

    Jul 31, 2023 · A keyhole sign suggests obstructive uropathy, of which the most common cause is posterior urethral valves. However, they found this to be more commonly associated with urethral atresia than posterior urethral valves and was not shown to be significantly predictive of posterior urethral valves.

  8. www.ncbi.nlm.nih.gov › pmc › articlesConsensus on the Management of Posterior Urethral Valves from...

    The keyhole appearance due to a distended posterior urethra is suggestive of obstructive uropathy. The most common cause is PUV. Other causes include vesicoureteral reflux, bilateral junction stenosis, Prune–Belly syndrome, primary megaureter, and ectopic obstructive ureteral implantation.[ 2 ]