A case of submuscular lipoma on the forehead

Lipomas are the most common mesenchymal neoplasms and are characterized by a lobular growth of mature adipocytes with a sharply demarcated border delineated by a thin fibrous capsule. Lipomas usually appear in the adipose tissue but occasionally develop in other mesenchymal tissues and can be classified as either subcutaneous or subfascial tumors. Subfascial lipomas are one of the most uncommon sites for soft-tissue tumors and can be intramuscular, intermuscular, or submuscular. Accordingly subfascial lipomas of the forehead can be differentiated into submuscular and subgaleal lipomas depending on the exact anatomic localization below the frontalis muscle or underneath the galea aponeurotica. The patient, a 33-year-old man, visited our clinic with a complaint of asymptomatic 2×2cm-sized dome-shaped tumor on his forehead. The tumor was surgically excised. During the operation the tumor was found to be located below the frontalis muscle and was revealed histopathologically as lipoma.