Unilateral renal dysplasia is a form of renal dysplasia (RD), a renal tract malformation in which the development of one kidney is abnormal and incomplete. Unilateral RD can be segmental, and of variable severity, with renal aplasia corresponding to extreme RD. The disease is MONDO_0019644 (renal dysplasia, unilateral). Also known as: unilateral renal dysplasia.