I am a 47yr old woman with a history of endometriosis. I have had a total of four surgeries over the years to include: 1) exploratory w/ removal of left ovary, 2) c-section, 3) surgery for burst uterus, & 4) hysterectomy in 1999. I am having surgery again to remove the cluster of cyst ranging from 7.5cms to as small as 2.5 cm in size and the remaining right ovary. These were found thru an ultrasound and then again with an MRI. For pre-op I had chest xrays and a cat scan which shows a hemangioma on the liver. They want to repeat the cat scan. Is the repeat cat scan necessary?? I am afraid that this may be way too much radiation. I am athletic & in fantastic health outside of the endometriosis.