Crossed renal ectopia. Correlative imaging.

Anatomic variants of the kidneys are often noted during renal scintigraphy and other imaging studies. These conditions have a variable effect on overall renal function and can cause confusion, both clinically and on initial imaging. The authors describe a case of unfused, crossed renal ectopia in an elderly woman that appeared to be an abdominal mass and was subsequently evaluated by computed tomography, ultrasound, and scintigraphy.