title: Effects of experimental obstructive hydronephrosis on the immature nephrons in newborn rats.
abstract: Partial obstruction of the left ureter was created in rats less than 36 h of age and its effects were studied at the age of 2-6 days. A considerable hydronephrosis with distension of the kidney developed within 1 day after obstruction, but there was no parenchymal weight reduction. The thickness of the mature, inner cortical layer was significantly decreased, suggesting a delay in the differentiation of the cortex. The parenchymal weight reduction, previously documented in our laboratory after long-standing ureteric obstruction, may thus be caused by a retardation of renal growth, which is never caught up, rather than by an atrophy of renal parenchyma or other destructive tissue lesions.
authors.affiliation: Department of Pediatric Surgery, St. Göran's Children's Hospital, Stockholm, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Josephson
authors.forename: B
authors.initials: B
authors.lastname: Robertson
authors.forename: M
authors.initials: M
authors.lastname: Rodensjö
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D006869:Hydronephrosis / Q000473:pathology*; D009399:Nephrons / Q000254:growth & development / Q000473:pathology*; D051381:Rats; D011919:Rats, Inbred Strains; D014517:Ureteral Obstruction / Q000473:pathology