Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hereditary multiple osteochondromas ?
    ### Response:
    Hereditary multiple osteochondromas is a condition in which people develop multiple benign (noncancerous) bone tumors called osteochondromas. The number of osteochondromas and the bones on which they are located vary greatly among affected individuals. The osteochondromas are not present at birth, but approximately 96 percent of affected people develop multiple osteochondromas by the time they are 12 years old.
    