I have recently had a ct angiogram in preparation for a mastectomy and bi-lateral breast reconstruction. The pre-op assessment was fine. I was called back to the surgeon who advised me that the angiogram showed that when the contrast entered my liver, the blood vessel swelled up like a balloon. My surgery has been postponed and I am awaiting an ultrasound to see what the problem is. I have been taking Tamoxifen for four years having had a mastectomy for grade 1 breast cancer, no radiotherapy or chemotherapy was necessary. Could the tamoxifen be the cause of the problem? The nurse who took my bloods said my veins were hard and are difficult to locate as though I'd had chemotherapy? Thank you.