has part has part characteristic of inheres in has modifier Carpal bone aplasia HP:0005056 UMLS:C4280537 Congenital absence of a carpal bone. HP:0006020 Missing wrist bone Radiographically difficult to distinguish between absent ossification of a carpal bone. HP:0006084 Absent carpal bone Absent carpal bones Absent wrist bone Absent carpal ossification center Aplastic carpal bone UMLS:C1836219 Absent carpal ossification centre HP:0004231 Aplasia/Hypoplasia involving the carpal bones abnormal aplastic carpal bone