Posterior urethral valves are a urologic deformity involving a narrowing of the prostatic portion of the male urethra. This causes a bladder outlet obstruction. The sonographic criteria include hydronephrosis, bilateral ureterectasis, and enlarged bladder, with a “keyhole” appearance in the region of the obstruction of the prostatic urethra. Varying degrees of oligohydramnios will be present due to the inability of the fetus to release urine. Additional findings may include pulmonary hypoplasia due to lack of amniotic fluid. In severe cases, the bladder may rupture and cause urinary ascites within the fetal pelvis. A case study demonstrating this condition is presented.
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