When do you think I should have an angiomyolipoma renal tumor removed?

Angiomyolipoma. These are benign tumors. Small lesions discovered incidentally require no treatment. Larger tumors (>4cm) have an increased tendency to bleed spontaneously, and the chance of bleeding increases proportional to increasing size. So the larger or symptomatic lesions may require treatment, either surgery or embolization.