Which statement about the origin of MLTB radiographically is correct?

• A. It originates in the skull
• B. It originates in the pelvis
• C. It originates in the spine
• D. It originates in the long bones

Answer: (C)

Understanding where a bone tumor first appears on radiographs helps you infer its typical site of origin. For multilobular tumor of bone, the spine is the origin most consistent with imaging patterns because vertebral bodies have abundant red marrow and rich blood supply, which support hematogenous seeding and growth of such tumors. On radiographs, you’d expect the lesion to be centered in a vertebral body, often appearing as a lytic, expansile area with potential extension to adjacent vertebrae and possible soft tissue involvement. This axial, vertebral-centered pattern differentiates it from lesions that would originate in the skull, pelvis, or long bones, where you’d see centered changes in those structures (cranial vault for skull, bony pelvis for pelvic origin, or metaphyseal/diaphyseal regions of long bones with different periosteal reactions).