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fetal hydronephrosis

Thursday 19 February 2004

Definition: Dilatation of the renal pelvis and calices due to a urinary obstruction.

Fetal hydronephrosis is the most common cause of an abdominal mass of genitourinary tract origin in neonates.

Types

- unilateral fetal hydronephrosis
- bilateral fetal hydronephrosis

Synopsis

- pelvicalyceal dilatation
- renal parenchymal atrophy
- renal parenchymal fibrosis
- blunting of medullary pyramids
- foci of residual renal parenchyma

Etiology

- unilateral congenital hydronephrosis

  • pelviureteric junction stenosis (most frequent cause)

- bilateral congenital hydronephrosis (20%)

Associations

- Renal dysplasia

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