An introduction to Myositis Ossificans Progressiva (MOP)

Myositis Ossificans Progressiva (MOP), also known as Fibrodysplasia Ossificans Progressiva, is a condition caused by formation of bone within muscles. When muscle is damaged, instead of the muscle repairing itself, the tissue turns into bone. The bone formation is usually first noticed in early childhood as a series of hard lumps in the neck or along the spine. The lumps, which may be tender, gradually shrink in size as the affected muscles are replaced by bone.

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