Renal angiomyolipoma

Overview

• A renal harmatoma.
• The most common benign tumor of the kidney.
• Almost all (95%) have macroscopic fat.
• Usually incidental findings.

Clinical significance

• Assoc. with Tuberous sclerosis complex esp. multiple / bilateral involvement in young patient
• Size > 4 cm or contain aneurysm → bleeding risk ↑
  • Considered intervention consultation for embolisation

Lipid-poor renal AML

• Rare (5%), more commonly seen in TSC.
• Have to ddx with papillary RCC.
  • Unlike RCC, lipid-poor renal AML don't have calcification
• Differential diagnosis: Renal hypoT2 lesions