has_part has part has part Renal hypoplasia Renal agenesis Renal hypoplasia/aplasia Renal agenesis/hypoplasia Absent/small kidney HP:0004744 UMLS:C1857453 Absent/underdeveloped kidney Absence or underdevelopment of the kidney. Renal aplasia/hypoplasia HP:0008678 HP:0008701 Abnormal renal morphology