This is a natural history study involving the imaging characteristics of angiomyolipomata found in patients with tuberous sclerosis complex. This study offers the potential benefit that the lesion characteristics and growth rate will be monitored. Patel et al. posit that growth rates of greater than 0.5 cm/year for solid tumors are worrisome for malignancy. Patients harboring lesions that exhibit faster growth rates will be identified so that they can be more carefully monitored. During the course of the study, should we detect concerning features, the Consortium Center TS Clinic Director will be alerted. Imaging modalities that may be used include CT scans. The patient data being collected will be done so for clinical reasons, and every effort will be made to use the least possible radiation exposure. There are several ways to reduce the exposure, and these limiting techniques will be employed for each scan. The scans will be performed both pre and post contrast using an agent such as Optiray® so that vascularity can be assessed. Patients may also be imaged with a 1.5 Tesla magnet in a supine position using a phased array torso coil or body coil, depending on patient size. When compatible, respiratory compensation will be used to diminish respiratory artifact. Overall imaging time for the following sequences will be approximately 45 minutes.