Polycystic kidney. The entire parenchyma is occupied by numerous cysts. The renal pelvis is not distended. These cysts must have formed during renal development, due to inappropriate fusion between the secretory portion of the metanephron and the excretory portion of the Wolff duct derivatives, originating small retention cysts. This lesion affects the entire parenchyma and is frequently bilateral, making it incompatible with life.



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