Traumatic myositis ossificans of the superior belly of the omohyoid.

The first case of traumatic myositis ossificans (TMO) involving a strap muscle of the neck is reported. TMO typically presents with an unresolved mass following trauma or surgery, requiring differentiation from other soft tissue and bone neoplasms. Opacification may be present on soft tissue X-rays. Computed tomography (CT) scan may demonstrate a characteristic zoning phenomenon to establish the diagnosis. The disorder is frequently self-limiting but surgery may be required for persistent symptoms.