Because of his limited kidney function after the surgery, Bland could not be monitored with conventional computed tomography (CT) scans because contrast agents used in CT scans could further damage the kidney. Instead, his doctors switched to a hybrid form of positron emission tomography (PET)-CT scans.  “PET scans are not typically used to monitor kidney cancer due to their low sensitivity. But sarcomatoid tumors are typically high grade, so they are more likely to take up the radioactive imaging agent used in PET scans,” says Paul. {read more here}