Crossed renal ectopia - antenatal ultrasound

Case contributed by Maulik S Patel
Diagnosis almost certain

Presentation

Primigravida. Gestational age 14 weeks 0 days. No complaints.

Patient Data

Age: 25 years
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Single live fetus with growth corresponding to the gestational age. The left side of the fetal abdomen shows two adjacent/ bilobed kidneys measuring 11 mm in length. Two separate small cystic spaces possibly correspond to the two renal pelvis.

Gestational age 37 weeks

ultrasound
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Bilobed left renal kidney(s) measuring 56 mm in length. Normal corticomedullary differentiation. No hydronephrosis or cysts. A notch is present between two renal parenchyma. Normal urinary bladder. Low-lying adrenal on the right side due to an absent kidney in the right renal fossa.

Case Discussion

A 14-week scan raised the possibility of crossed renal ectopia. 20-week scan which was done somewhere else confirmed the finding (not uploaded, no copyright). It is easy to see crossed as well as fused renal ectopia at a 37-week scan. There was no associated anomaly.

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