Abstract
The inbred mouse strain DDD was found to have an extremely high incidence of hydronephrosis (37/37 in adult males and 12/32 in adult females). The hydronephrosis was classified as open with no definite cause for obstruction. The condition was either unilateral in the right kidney or bilateral. Another feature of the hydronephrosis kidney was circulatory failure. Hydronephrosis in strain DDD mice is considered to be a useful experimental animal model with additional possible use, in investigating disturbances of renal haemo-dynamics and function.