Tear of the sternocleidomastoid muscle: a rare complication of lifting weights that can be managed conservatively

A 24-year-old man presented to the emergency department with a five-day history of right-sided swelling of the neck, and pain. He also reported weakness and tingling of the right arm after he had moved a large sheet of metal (50kg) nine days previously. This slipped, which jolted his neck and caused pain for an hour after the injury, and was followed by a painful swelling in the neck that had not changed in size.

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