Giant Lipoma in the Trapezius Muscle: A Rare Case Report

Abstract Intramuscular lipomas, although rare, are benign growths within muscle tissue. Typically occurring between ages 40 and 70, they present as infiltrative masses, with the thigh being the most common location. Lipomas exceeding 5 cm are termed giant lipomas. Instances within the trapezius muscle are notably scarce, necessitating further research due to their relative rarity. A 40-year-old male presented with a 2-year history of a tumor on his right shoulder, causing mild limitation but no pain or tingling. Initial attempts at removal failed due to depth. Imaging revealed a well-defined, vascular mass, confirmed by MRI as a 1041 cm3 intramuscular lipoma in the right trapezius muscle. Surgical extraction was successful without complications. Few cases of intramuscular lipomas in the trapezius muscle have been reported. These slow-growing masses can cause discomfort and mimic other conditions. MRI is crucial for accurate diagnosis, distinguishing them from other soft tissue tumors. Surgical excision is preferred for symptomat cases, with low recurrence rates. This case highlights a rare giant intramuscular lipoma in the trapezius muscle, emphasizing the importance of precise imaging for diagnosis. Further epidemiological research on intramuscular lipomas is needed, particularly in the trapezius muscle. Level of Evidence: 5 (Therapeutic)