Association of multicystic dysplasia and crossed nonfused renal ectopia: a case report.

Crossed renal ectopia is an unusual anomaly, 90% of which is fused to the ipsilateral kidney. Multicystic dysplasia in association with crossed non-fused renal ectopia is a very rare phenomenon and can produce a palpable abdominal mass. We report a 2-year old girl who presented with a mass in the abdomen. Detailed evaluation including laparotomy confirmed a diagnosis of multicystic dysplasia in a crossed non-fused ectopic kidney. This diagnostic entity should be considered, when a mass is found in the abdomen or pelvis, and when no kidney can be found in it's normal ipsilateral position.