Osteosarcoma is the eighth most common form of childhood cancer, comprising 2.4% of all malignancies in pediatric patients, and approximately 20% of all primary bone cancers.

Incidence rates for osteosarcoma in U.S. patients under 20 years of age are estimated at 5.0 per million per year in the general population. It is slightly more common in males than in females .

It originates more frequently in the metaphyseal region of tubular long bones, with 42% occurring in the femur, 19% in the tibia, and 10% in the humerus.  About 8% of all cases occur in the skull and jaw, and another 8% in the pelvis.

Image  Source Radiopaedia.org (link)     (larger image here 1,024 x 1,024 pixels)

Osteosarcoma of the distal femur in a 13 year old boy

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