This anomaly is relatively frequent. One speaks of a malrotation if the pyelo-ureteral connection is oriented ventrally (missing rotation), dorsally (rotation of more than 90°) or laterally (inverse rotation). The kidney and urinary tract are here anatomically and histologically normal. Sometimes, though, one observes anomalies in the connections between ureter and renal pelvis, which can lead to a hydronephrosis (enlargement of the renal pelvis, the major and minor calices, leading in turn to an enlarged kidney). |
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Fig. 30 - Rotation anomaly |
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