Persistent fetal lobulation of the kidneys
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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
They should be distinguished from renal cortical scarringdefects, which generally overlies the pyramids.
-<p><strong>Persistent fetal lobulation</strong> is a normal variant seen occasionally in adult <a href="/articles/kidneys">kidneys</a>. 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.</p><p>It is often seen on ultrasound, CT or MRI as smooth indentations of the renal outline in between the renal pyramids.</p><h4>Differential diagnosis</h4><p>They should be distinguished from <a href="/articles/renal-cortical-scarring">renal cortical scarring</a>, which generally overlies the pyramids.</p>- +<p><strong>Persistent fetal lobulation</strong> is a normal variant seen occasionally in adult <a href="/articles/kidneys">kidneys</a>. 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.</p><h4>Radiographic features</h4><p>It is often seen on ultrasound, CT or MRI as smooth indentations of the renal outline in between the renal pyramids.</p><h4>Differential diagnosis</h4><p>They should be distinguished from <a title="Renal cortical defects" href="/articles/renal-cortical-defect">renal cortical defects</a>, which generally overlies the pyramids.</p>