Introduction
Positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) is a functional imaging technique that has demonstrated advantages over anatomically based imaging modalities in oncology in the detection of malignant lesions. The recent introduction of combined computed tomography (CT)/PET systems allows the coregistration of functional PET and anatomical CT images, which will very likely improve accuracy. The role of PET and CT/PET in breast cancer is reviewed.