Crossed fused renal ectopia
Incidental finding on ultrasound of the abdomen performed for other reasons.
US Abdomen (selected images)
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Crossed fused renal ectopia on the right. The left renal fossa is empty.
This patient has the anatomical variance of crossed fused renal ectopia on the right, with both kidneys fused along their longitudinal axes and an empty left renal fossa.