This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Myositis ossificans is differentiated from other reactive fibroblastic proliferations by the presence of:September 2009 
Select and explain. 
A. Dysplastic bone, B. Dystrophic bone, C. Metaplastic bone, D. Hyperophic bone
C: Metaplastic bone
Answer: C: Metaplastic bone 
Explanation: Ans. C: Metaplastic boneMyositis ossificans usually develops in the athletic adolescents and young adults and follows an episode of trauma in more than 50% of cases.The lesion typically arises in the musculature of proximal extremities.It shows metaplastic bone.It should be differentiated from extraskeletal osteosarcoma.