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Large Sternocleidomastoid Haematoma after Minor Trauma in a Postradiation Neck

Sternocleidomastoid (SCM) muscle haematoma after minor blunt injury is rare. Radiation therapy as a treatment for head and neck tumours e.g. nasopharyngeal cancer can result in complications, including fibrosis, scarring, and atrophy. We report a 51-year-old man suffering from massive haematoma of SCM muscle after minor blunt injury to a postradiation neck. Signs of haematoma were absent during his first visit to the emergency department. Emergency physicians need to be aware that bleeding from a postradiation neck, even after minor trauma, may be life threatening.