Persistent fetal lobulation of the kidneys

Last revised by Mateusz Wilczek on 4 Dec 2023

Persistent fetal lobulation is a normal variant seen occasionally in adult kidneys. It occurs when there is incomplete fusion of the developing renal lobules. Embryologically, the kidneys originate as distinct lobules that fuse as they develop and grow.

Radiographic features

It is often seen on ultrasound, CT or MRI as smooth indentations of the renal outline in between the renal pyramids.

Differential diagnosis

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