Preschooler with hydronephrosis

US of hypertrophied column of Bertin
Transverse (above) and sagittal (below) US of the kidney shows an oval mass-like lesion that has been stable over time in the posterior aspect of the upper pole of the kidney that is in continuity with the cortex of the kidney and has the same echogenicity of the cortex of the remainder of the kidney. Mild to moderate hydronephrosis is also present.

The diagnosis was hypertrophied column of Bertin.