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Unilateral renal agenesis (solitary kidney)

Imaging Findings:
Filling of the renal fossa with bowel loops (sharply outlined gas or fecal material in the plane of the renal fossa on nephrotomography). The contralateral kidney usually shows compensatory hypertrophy.

Rare anomaly that is associated with a variety of other congenital malformations. It is essential to exclude a nonfunctioning, diseased kidney by ultrasound or CT. After nephrectomy, the renal outline is generally preserved on plain films if the perinephric fat is left in situ.