title: Non-traumatic myositis ossificans circumscripta: A diagnosis trap.
abstract: Myositis ossificans circumscripta (MOC) is a benign condition of non-neoplastic heterotopic bone formation in the muscle or soft tissue. Trauma plays a role in the development of MOC, thus, non-traumatic MOC is very rare. Although MOC may occur anywhere in the body, the lesions are localized predominantly in the high-risk sites of injury, such as the thigh, buttock, and elbow. MOC can easily be mistaken for osteomyelitis or a malignant tumor, specifically osteosarcoma or soft-tissue sarcoma. We report a rare case of non-traumatic myositis ossificans circumscripta of thigh which appear clinically and radiologically as a malignant neoplasm. Despite its rarity, MOC should be contemplated in the differential diagnosis of malignant tumors.
authors.affiliation: Department of Orthopedic Surgery, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Ahmed
authors.initials: A
authors.lastname: El Bardouni
authors.affiliation: Department of Orthopedic Surgery, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Monsef
authors.initials: M
authors.lastname: Boufettal
authors.affiliation: Department of Pathological Anatomy, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Fouad
authors.initials: F
authors.lastname: Zouaidia
authors.affiliation: Department of Orthopedic Surgery, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Kharmaz
authors.affiliation: Department of Orthopedic Surgery, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Berrada
authors.affiliation: Department of Pathological Anatomy, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Najat
authors.initials: N
authors.lastname: Mahassini
authors.affiliation: Department of Orthopedic Surgery, Ibn Sina Hospital, University Mohamed V, Rabat, Morocco.
authors.forename: Moradh
authors.initials: M
authors.lastname: El Yaacoubi
keywords: Differential diagnosis; Myositis ossificans; Non-traumatic; Thigh