NON-TRAUMATIC MYOSITIS OSSIFICANS: CASE REPORT
İzmir Katip Çelebi Üniversitesi Atatürk Eğitim ve Araştırma Hastanesi, Spor Hekimliği Bölümü, İzmir
Keywords: Myositis ossificans, non-traumatic injury, neoplasia, X-ray
Myositis ossificans is essentially an extraosseous bone formation without inflammation that occurs in muscle. Although the most common areas that are affected by myositis ossificans (MO) are the quadriceps femoris and brachialis muscles, it may occur anywhere else. MO most frequently occurs in adolescents and young adults. In 60-70% of the cases direct and repetitive trauma is reported. Furthermore, myositis ossificans may occur congenitally or idiopathically. There are rare reports of non-traumatic MO. Especially, it is difficult to distinguish this condition from soft tissue and bone malignancies radiologically; whereupon biopsy may be necessary to confirm the diagnosis. A 22 year-old-female patient without history of trauma, complained of pain in the front and upper parts of the left thigh was pre-diagnosed with muscle strain following the first physical and radiological evaluations, and was followed-up. Because of the patient’s ongoing symptoms, MRI was obtained at follow-up and neoplasm or infectious systemic disease was suspected in connection to the MRI and patient’s history. Thereafter, laboratory tests and fine-needle biopsy were performed, and the suspected differential diagnoses were excluded. Finally, a plain X-ray was obtained again and limited calcification area near the hip joint was observed, and the patient was subsequently diagnosed with MO. Following conservative therapy including resting, medical treatment and exercise program, the symptoms disappeared by 80-90%, and the patient returned to her normal activities.