Posterior urethral valve - antenatal ultrasound
Early third trimester scan. No complaints.
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Liquor is nearly absent.
Urinary bladder is over-distended with "key-hole" appearance.
There is bilateral hydronephrosis and hydroureter.
Right sided moderate hydronephrosis. Right kidney - 34 mm length
Left sided gross hydronephrosis. Left kidney - 43 mm length. There is thin rim of perinephric fluid on the left side.
Finding of oligohydramnios due to a posterior urethral valve.
Urinary bladder shows keyhole sign.