Which statement best describes Paget's disease bones?

• A. Extensively vascularized, weak, enlarged, and deformed
• B. Dense sclerotic with no remodeling
• C. Normal remodeling with increased density
• D. Osteogenesis imperfecta-like brittle bones

Answer: (A)

Paget's disease involves high-turnover bone remodeling that is abnormal and disorganized. Osteoclasts resorb bone rapidly, and osteoblasts lay down new bone in a haphazard, mosaic pattern. This combination makes the affected bones grow larger and become structurally weaker, while also driving extensive new blood vessel formation. The result is bones that are enlarged, deformed, and highly vascular—precisely described as extensively vascularized, weak, enlarged, and deformed.

The other descriptions don’t fit because remodeling in Paget’s is not normal or absent; it is accelerated and chaotic with cycles of resorption and formation. Saying there is no remodeling or normal remodeling with just increased density misses the dynamic, abnormal turnover. And osteogenesis imperfecta–like brittle bones reflect a collagen defect rather than the disorganized, high-turnover remodeling seen in Paget’s.