Abstract
A 40-year-old man had noted left upper neck swelling for 20 days. A 6 x 6 cm smooth, hard, fixed mass was palpable on the left side of the upper neck. CT scan did not show a clear boundary between the mass and the sternocleidomastoid muscle. Biopsy was performed, and the microscopic diagnosis was proliferative myositis. Therapy was conservative, and the mass disappeared completely two months after the start of the therapy. The patient is free of disease for more than one year after the therapy. Proliferative myositis is a benign self-limited lesion, so it is very important to distinguish it from malignant diseases.
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