What is FDG avid abdominal or pelvic lymph nodes?

FDG avid abdominal or pelvic lymph nodes refer to lymph nodes in the abdominal or pelvic regions that show increased uptake of fluorodeoxyglucose (FDG) during positron emission tomography (PET) imaging. This increased uptake often indicates heightened metabolic activity, which may suggest the presence of malignancy, infection, or inflammation. Clinically, FDG avidity is used to assess the extent of diseases, particularly cancers, and to monitor treatment response. However, further evaluation is often necessary to determine the underlying cause of the increased FDG uptake.