I was told by an orthopedic oncologist that my tumor was benign without a biopsy, is that possible? i had a bone scan, x-rays, and a ct scan.

Very much so: Bone tumors are much more characterized by their appearance in imaging studies, and they have correlated with outcomes after exhaustive studies. So when the musculoskeletal oncologist calls it benign, it's petty benign. He should even give you an estimated risk of the tumor changing in any way.

Yes for some tumors: Certain tumors have a classic appearance on x-ray and other imaging studies that can classify them without a biopsy. History is critical. Pain associated with benign appearing tumors is not a good sign, pain that wakes you from sleep is a bad sign, an enlarging mass is a bad sign, and a change in size or appearance on x-rays taken at several month intervals is a bad sign. Discuss with your doc!

Yes: It is possible by the appearance of the tumor on these scans.

Bone tumor: There are both benign and non benign tumors seen on imaging studies. Benign tumors often have an appearance that resembles their expected appearance such as we see in the textbook reference. When they look so much like a benign tumor, there is quite often not a need to perform a biopsy since the tumor appears so consistent with the textbook appearance.