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A 66-year-old woman with swelling of left mandibular region. A, Axial CT in soft tissue window demonstrates foci of air adjacent to the left mandible (arrow) and swelling of masseter and medial pterygoid muscle (arrowheads). B, Axial STIR MR image shows extensive inflammation in the left masseter muscle, medial pterygoid muscles, parotid gland (arrowheads), and mandibular bone marrow (arrow).
