Introduction: Myositis ossificans [MO] is a benign heterotropic bone forming (often- self resolving) pathology of bone and soft tissue. Here we are reporting the first time in literature for osteomyelitis of myositis ossificans in arm of a male due to trauma as a perusal of rare entity.

Case Report: It is a case report of a 25 years old male presented to us in out-patient department with chief complaint of discharging wounds over mid part of left arm since six months. Clinically provisional diagnosis of chronic osteomylitis of left humerus made and his x-ray sought. X- Ray showed geographic appearance of myositis ossificans around the upper two third of left arm. Sinuses curetted and infected bone (part of myositis ossificans) removed and sent for biopsy. Now the patient is discharge and sinus free, and has resumed his work.

Conclusion: Osteomyleitis of myositis ossificans should be recognized as a possible differential diagnosis chronic discharging sinus. This type of presentation of myositis ossificans is rarest.

Keywords: Osteomyelitis, myositis ossificans, arm.

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