Pectoralis major lipoma
Palpable swelling of the left anterior chest wall.
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An intramuscular lipoma of the left pectoralis major muscle
Lipomas are common benign mesenchymal neoplasms composed of adipocytes that originate within the subcutaneous tissues. These tumors can arise from either within the muscle (intramuscular) or between the muscles (inter-muscular). Lipomas usually occur within the extremity muscles, such as the thigh and shoulder. Intramuscular pectoralis lipomas are a rarity.