How can imaging help distinguish metastasis from degenerative changes in the cervical spine?

• A. Metastasis shows focal destructive or blastic lesions with soft tissue mass; degenerative changes show osteophytes and endplate sclerosis without mass.
• B. Metastasis shows only degenerative changes.
• C. Degenerative changes show soft tissue mass.
• D. Degenerative changes show osteophytes but always with fractures.

Answer: (A)

Imaging distinguishes metastasis from degenerative changes by looking for how the bone responds and whether there is any extension outside the bone. Metastatic disease in the cervical spine tends to create focal destructive lesions or blastic (sclerotic) lesions, and these are often accompanied by a soft-tissue mass that extends into the surrounding tissues. This mass reflects tumor growth and potential marrow replacement, and can compress neural structures. Degenerative changes, in contrast, are a response to wear and tear and show osteophyte formation at vertebral margins and endplate sclerosis, along with disc-space narrowing and facet joint arthropathy. They do not produce a soft-tissue mass or destructive bone patterns. So, when imaging reveals a destructive or blastic lesion with a paraspinal soft-tissue mass, metastasis is favored; when it shows osteophytes and endplate sclerosis without a mass, degenerative disease is favored. CT highlights bone destruction and mineral changes, while MRI helps assess marrow involvement and soft-tissue extension for metastasis, versus the more localization-focused degenerative patterns.