Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hereditary multiple osteochondromas ?
    ### Response:
    Hereditary multiple osteochondromas (HMO) (formerly called hereditary multiple exostoses) is a genetic condition in which people develop multiple benign (noncancerous) bone tumors that are covered by cartilage (called osteochondromas). The number and location of osteochondromas varies greatly among affected individuals.
    