ELN and angiomyolipoma: It occurs in up to 50% of patients with tumors larger than 40 mm because of the association with an increased risk of intralesional aneurismal formation and, therefore, a greater possibility of rupture.[4] In fact, having abnormal elastin-poor vascular structures, angiomyolipomas are likely to form aneurisms as they grow and as the blood flow entering them increases.