Lipomas are benign tumors composed of mature fat cells.
They are the most common benign mesenchymal tumor. Lipomas are found in the subcutaneous tissues and, less commonly, in internal organs. They usually present with little difficulty in diagnosis or morbidity. Lipomas typically develop as discrete rubbery masses in the subcutaneous tissues of the trunk and proximal extremity. They usually are a few centimeters in size and can be removed by surgical excision or liposuction.