What is an angiomyolipoma?

An angiomyolipoma (AML) is a benign tumor composed of blood vessels, smooth muscle, and fat tissue. AMLs are most commonly found in the kidney, but can also occur in the liver, spleen, and other organs.

AMLs are usually asymptomatic and are often found incidentally during imaging studies performed for other reasons. However, large AMLs can cause symptoms such as abdominal pain, flank pain, or a palpable mass.

The diagnosis of AML is made by imaging studies, such as ultrasound, CT, or MRI. A biopsy may be necessary to confirm the diagnosis in some cases.

Treatment for AML is usually not necessary unless the tumor is causing symptoms. If treatment is necessary, options may include surgery, embolization, or radiofrequency ablation.

The prognosis for AML is excellent. The tumors are typically benign and do not spread to other organs.