A rare primary bone dysplasia disorder characterized by the development of multiple mainly unilateral or asymmetrically distributed enchondromas throughout the metaphyses of the long bones. The disease is MONDO_0008145 (Ollier disease). Also known as: Kast's syndrome, Ollier type enchondromatosis, Ollier's disease, dyschondroplasia, enchondromatosis with haemangiomata, enchondromatosis, multiple, osteochondromatosis.