Removal of a multicystic half of a horseshoe kidney: significance of preoperative evaluation in identifying abnormal surgical anatomy.

A rare case of multicystic dysplasia in half of a horseshoe kidney is presented. Proper evaluation led to a modified surgical approach necessary for adequate exposure, division of the isthmus, and removal of the diseased component. Considerations applicable to the treatment of multicystic dysplasia and renal fusion are discussed. The surgical anatomy of horseshoe kidney is reviewed.