Lipomas are the most common soft-tissue tumor. These slow-growing, benign fatty tumors form soft, lobulated masses enclosed by a thin, fibrous capsule. Lipomas are common benign mesenchymal tumors. They may develop in virtually all organs throughout the body. The anatomy depends on the tumor site. Subcutaneous lipomas are usually not fixed to the underlying fascia. The fibrous capsule must be removed to prevent recurrence. The cause of lipomas is not completely understood, but the tendency to develop them is inherited.
A minor injury may trigger the growth. Being overweight does not cause lipomas. No treatment is usually necessary for a lipoma. However, if the lipoma bothers, treatments includes, Surgical removal, Steroid injections, Liposuction. Angiomyolipomas are the most common benign solid renal lesion and also the most fat containing lesion of the kidneys. The majority of angiomyolipomas are sporadic (80%) and are typically identified in adults (mean age of presentation 43 years), with a strong female predilection (F:M of 4:1).