Renal Fusions and Ectopia

Cross ectopic multicystic dysplastic kidney with ureterocele in nonectopic site

“…1 Crossed renal ectopy is relatively common in males; in most of these cases, the left kidney is crossed to the right. There is great variability in the aberrant vascular supply, which can arise from either side of the lower aorta or from the common or external iliac arteries.…”

“…2 Although most of the CRE cases are asymptomatic and incidentally diagnosed, early diagnosis may prevent possible urinary infections, obstructions and malignancies. 3,4 We present a left-to-right crossed multicystic dysplastic ectopic kidney associated with right severe hydronephrosis due to right ureterocele. Our patient had CRE without fusion, which is extremely rare; this makes our report very interesting since most of the previously reported CRE cases were with fusion.…”

Ultrasound and magnetic resonance imaging features of fetal urogenital anomalies: A pictorial essay

“…Doppler-US can help in the diagnosis by finding the vascular pedicle of the ectopic kidney. 6 DWI-MRI can be helpful in showing kidney tissue in an abnormal location due to the showing restriction in the kidney parenchyma (white fields). Also, MRI is an accurate method for evaluating the details of renal ectopia, especially when accompanying other anomalies.…”

“…However, in the final weeks, such as the second trimester, it may be difficult to detect renal ectopia on ultrasound. Doppler‐US can help in the diagnosis by finding the vascular pedicle of the ectopic kidney 6 …”