Abstract
Multifocal osteosarcoma (MOS) is a rare variant of osteosarcoma that is defined by two or more tumors at any site of the peripheral or axial skeleton. MOS can be categorized into two types: synchronous (multiple lesions that appear to develop within 6 months) and metachronous (new lesions that develop over a time interval longer than 6 months)). Synchronous MOS first appears during childhood or early adolescence and has been reported to account for approximately 0.4-4.2% of all osteosarcoma cases, which occurs in nearly symmetrical and multiple locations in the metaphyseal of long bones. (Published: 28 February 2013) Citation: Libyan J Med 2013, 8 : 20359 - http://dx.doi.org/10.3402/ljm.v8i0.20359
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