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Urinary and Genital Disorders (Children)

Asymmetry of kidneys



My baby boy is 4 weeks old and his left kidney is larger than the right one. Is that a problem?


You have not provided enough information. It is unclear whether there is hydronephrosis (extra fluid in the kidney), and why an ultrasound was performed in the first place. A kidney may be enlarged because of a duplicated collecting system (normal variant) or may be associated with a developmental problem. Also, one needs to determine whether the larger kidney is larger than normal or the smaller kidney is smaller than normal.

Generally, pediatric urologists and nephrologists evaluate this condition.

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Response by:

Jack S Elder, MD, FACS, FAAP Jack S Elder, MD, FACS, FAAP
Clinical Professor of Urology
School of Medicine
Case Western Reserve University