Hi and welcome at the forum! I am glad that I can help you.
You want to know whether you should get another opinion for the diagnosis of the symptoms that you experience.
Angiomyolipoma is a renal tumor previously considered to be a hamartoma or choristoma, but now known to be malignant. It is composed of variable amounts of fat, vascular, and smooth muscle elements. If the tumor starts to grow by invading the healthy surrounding tissue without definite borders, any kind of tumor including angiomyolipoma may be considered as malignant. Final diagnosis of the type of a tumor is based on a biopsy and pathological exam from a tissue sample.
Given the data that you described, you experience angiomyolipoma with a diagnosis based upon an ultrasound. You may consider having an ultrasound exam every 3 or 6 months to determine whether the tumors increase in size. You may need to have surgery to remove it, if growth of the tumor is confirmed with the ultrasound.
Please keep in mind that I provide medical information only. I am not able to diagnose medical information online. Please contact your doctor for further advice and information about diagnosis and treatment of angiomyolipoma.