The risk of PET/CT consists in the extra radiation dose (5-6mSv, p 4), which the PET-examination adds to the patient beyond the dose from CT (18-20mSv). The dose of radiation from PET is insignificant (a total estimated risk: 1/10.000), while the estimated risk from the radiation dose of CT is 1/1000. The lifetime risk of developing cancer is 25%. Performing the PET/CT scan increases the lifetime risk from 25% to 25,1%.