Crossed fused renal ectopia
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No renal structure is seen in the right lumbar fossa.
The right kidney crosses the midline and is fused to the lower pole of the left kidney, forming a crossed fused renal ectopia. Both kidneys are malrotated with evidence of pelviureteric junction obstruction of the left kidney. The ureter of the right ectopic kidney crosses the midline anterior to the left common iliac vessels and enters the bladder on the opposite side.
CT-IVU features of a crossed fused renal ectopia type an according to McDonald and McClellan's classification of crossed renal ectopias with associated left pelviureteric junction obstruction.
Right left renal ectopia is less common than left to right