label: asynchronous multifocal osteogenic sarcoma
label_lc: asynchronous multifocal osteogenic sarcoma
description: A bone osteosarcoma affecting multiple skeletal sites, with multifocal lesions discovered between 6 and 24 months after the appearance of the initial tumor. Patients with asynchronous tumors have a better prognosis than those with synchronous osteosarcomas.