Benign tumors composed of adipose tissue.
Can occur in any area of the body, although they are most frequently found on the trunk or proximal limbs. Most commonly found in subcutaneous tissues.
Rare sites include GI tract, adrenal glands, parotid glands, parapharyngeal space, breast, mediastinum, pleura, airways, heart, superior vena cava, brain, and intraspinal areas.
Cutaneous lipomas are usually soft, mobile, and superficial.
No malignant potential. However, the differential diagnosis includes liposarcomas, which are malignant, so this must always be carefully considered.
Surgical resection is indicated for symptomatic relief, pathologic confirmation, or cosmetic reasons, or if there is an increase in size.
Lipomas are slow-growing, benign, mesenchymal tumors that form well-circumscribed, lobulated lesions composed of adipocytes. They are demarcated from surrounding fat by a thin, fibrous capsule. They comprise 50% of soft-tissue neoplasms and are commonly encountered by primary care physicians, surgeons, and pathologists.  Lipomas usually arise in the subcutaneous tissues and may occur in any area of the body, although they most frequently occur on the trunk and proximal limbs. They have no malignant potential, but the differential diagnosis includes liposarcomas, which do have this potential, so this must always be considered.
Medical Director, Surgical Oncology
Peninsula Medical Clinic
Palo Alto Medical Foundation
KMD is an author of a number of references cited in this monograph.
SDD declares that he has no competing interests.
VA Boston Healthcare System
Assistant Professor of Surgery
Harvard Medical School (Brigham and Women's Hospital)
JG declares that he has no competing interests.
Department of Dermatology
Wake Forest University School of Medicine
ADL declares that he has no competing interests.
Department of Surgery
University of Nebraska Medical Center
CA declares that he has no competing interests.
Department of Surgery
Section of Surgical Oncology
University of Wisconsin School of Medicine and Public Health
CC declares that he has no competing interests.
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