Left sternocleidomastoid intramuscular hemorrhage from penetrating trauma
Left sided stab wound to the neck.
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CTA neck demonstrates a markedly enlarged left sternocleidomastoid muscle expanded in a fusiform configuration particularly in its mid-section consistent with a intramuscular hematoma. There is a tiny round focus of contrast blush within the muscle intimately associated with a tiny vessel suggestive of active bleeding (Image 85 of 130) . The intramuscular gas locules are consistent with a history of penetrating injury.