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What's your diagnosis based on the ultrasound of this 34-week old fetus?
Fetal uretero-pelvic (pelvi-ureteral) junction obstruction
Right UPJ or PUJ obstruction. The right kidney alone shows severe hydronephrosis; the left kidney is not affected. In a bladder outlet obstruction both kidneys should show hydronephrosis with the bladder hyperdistended. Polycystic and multicystic kidneys are hence also ruled out as these pathologies show totally different features.
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