The findings of x-ray are consistent of chondrosarcoma from the transverse processes of the lumbar vertebrae. (histology proven)

Chondrosarcoma usually occurs in the trunk bones (pelvic girdle, shoulder, ribs) followed by the femur and humerus and is very rare in the spine accounting for about 5% of all chondrosarcomas. 

 A case of  Prof.Saeed Rad, Tabriz,Iran.