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29 de jul. de 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.
9 de oct. de 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.
2 de ene. de 2024 · keyhole sign may be seen on ultrasound due to the distention of both the bladder and the urethra immediately proximal to the valve. Unfortunately, such findings are generally not seen before 26 weeks of gestation, and as such are not frequently identified on routine morphology screening, usually carried out around 18 weeks gestation 5.
1 de feb. de 2018 · Ultrasound plays an important role in characterizing this condition, revealing a classic configuration known as the keyhole sign: dilatation of the bladder and hypertrophy of the walls producing a rounded shape, accompanied by dilation of the proximal portions of the urethra, creating a keyhole-like contour (Figs. 1, 2) .
6 de may. de 2024 · A "keyhole" sign detected on ultrasound indicates obstructive uropathy, with posterior urethral valves being the most common cause. However, studies have shown that this sign is more commonly associated with urethral atresia than with posterior urethral valves, and its predictive value for posterior urethral valves is not significant.
18 de nov. de 2015 · A “keyhole” sign may be seen in cases of PUV, which reflects dilation of the posterior urethra, proximal to the level of the obstruction; however the “keyhole” sign (Fig. 1) is not a specific ultrasound sign of PUV and may also be present in different causes of LUTO [ 6 ].
