Fluorodeoxyglucose (FDG) is a radiopharmaceutical used in medical imaging, particularly in Positron Emission Tomography (PET) scans. Structurally, FDG is a glucose analog, meaning it mimics glucose but has been fluorinated at the 2' position. When labeled with the radioactive isotope fluorine-18 (18F), it becomes 18F-FDG, which is commonly used in oncology for diagnosing and monitoring various cancers.
