renal hypoplasia

hypoplastic kidneys

Definition: Congenitally small kidney (below two standard deviations below the expected mean) that lacks evidence of parenchymal maldifferentiation (renal dysplasia) or of acquired disease sufficient to explain the reduced size.

Classification

unilateral renal hypoplasia
bilateral renal hypoplasia

bilateral simple renal hypoplasia
bilateral oligonephronic renal hypoplasia

segmental renal hypoplasia

Associations

isolated renal hypoplasia (non-syndromal renal hypoplasia)
renal dysplasia (renal hypodysplasia)
oligomeganephronic renal hypolasia
syndromal renal hypoplasia (in malformative syndromes)