Keyhole sign (posterior urethral valves)
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Keyhole sign
(posterior urethral valves) • Posterior urethral valve - antenatal ultrasound - Ganzer Fall bei Radiopaedia
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Keyhole sign
(posterior urethral valves) • Posterior urethral valve - antenatal ultrasound - Ganzer Fall bei Radiopaedia
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Keyhole sign
(posterior urethral valves) • Posterior urethral valves - antenatal - Ganzer Fall bei Radiopaedia
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Keyhole sign
(disambiguation) • Posterior urethral valves - Ganzer Fall bei Radiopaedia
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Keyhole sign
(disambiguation) • Keyhole (photo) - Ganzer Fall bei Radiopaedia
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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