A lipoma is a non-cancerous growth composed of mature fat cells. It is one of the most common soft tissue tumors and can occur almost anywhere in the body, frequently just beneath the skin. On ultrasound, lipomas typically appear as well-circumscribed, oval masses that are isoechoic or slightly hyperechoic relative to surrounding fat, often with thin internal linear echoes running parallel to the skin surface. They are soft, compressible, and generally do not demonstrate significant blood flow on Doppler. While lipomas are benign and usually require no treatment, ultrasound helps distinguish them from other soft tissue masses that may need further workup.
Sonography Term