What best describes osteoblastic lesions in bone metastases?

• A. Abnormal dense bone buildup that is still fragile.
• B. Osteolytic bone destruction with softening.
• C. Normal healthy bone remodeling.
• D. Increased joint flexibility due to inflammation.

Answer: (A)

Osteoblastic (sclerotic) metastases involve tumor-driven stimulation of osteoblasts, leading to new bone formation. This creates dense, sclerotic areas on imaging, but the new bone is often structurally disorganized and brittle. So you can see abnormal dense bone that may be fragile and prone to fracture rather than strong, healthy remodeling.

That’s why the best description is abnormal dense bone buildup that is still fragile. The other ideas describe different processes: osteolytic lesions involve bone destruction and softening, normal healthy remodeling isn’t metastatic, and increased joint flexibility from inflammation points to arthritis, not metastatic bone changes.