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Urogenital Imaging

Fetal lobulation, renal

embryologically, the kidney develops in several lobules. Incomplete fusion of these lobules can persist postnatally and even into adult life. This fetal lobulation is recognized on intravenous urography as smooth regular indentations in the renal contour, without parenchymal thinning or abnormalities in the underlying calyx. Inflammatory scars are deeper and typically associated with an abnormal underlying calyx. Renal infarcts are generally random in distribution and cause a broad flat depression in the renal outline. Fetal lobulation may also be recognized at CT, MRI or ultrasound.

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