How to tell if i have osteosarcoma?

Biopsy: Osteogenic sarocoma usually presents with bone pain in the area involved with/ without a noticeable mass. While it has a particular appearance on radiology studies, the way to confirm the diagnosis is to obtain a biopsy. So see your doctor for the oppropriate studies and biopsy if indicated.

Combination of .....: Physical examination and history, xrays, MRI and possibly ct scan of the body part involved will provide a very good idea as to the diagnosis. However, looking at the abnormal tissue under a microscope may be required to make the correct, final diagnosis. Obtaining this tissue would necessitate a biopsy.

See a physician: Osteosarcoma in your age group is low probability but the only definitive way of knowing anything about a tumor is to biopsy it and have the cellular structure reviewed by a pathologist. Often physicians use age, location and appearance on different studies to give a probable diagnosis of a tumor but its not definitive without tissue analysis.