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  Indian J Med Microbiol
 

Figure 4: Positron emission tomography (PET) scan of a patient with diffuse large B cell lymphoma involving right lung done 3 h after intake of food. Maximum intensity projection image (a) diffusely increased uptake in muscles and faint uptake noted in the right lung (maximum standardized uptake value [SUVmax = 3.1]). However repeat study after adequate preparation and 6 h of fasting shows (b) increased F-18 fluoro-deoxy-glucose (FDG) uptake in the right lung lesion (SUVmax = 12). Learning point in this image is that inadequate fasting increases insulin mediated muscle uptake with a decrease in tumoral uptake of F-18 FDG that might lead to false negative interpretations and inadequate baseline study to evaluate response at a later date. This image highlights the importance of adequate fasting prior to F-18 FDG PET/computed tomography scan

Figure 4: Positron emission tomography (PET) scan of a patient with diffuse large B cell lymphoma involving right lung done 3 h after intake of food. Maximum intensity projection image (a) diffusely increased uptake in muscles and faint uptake noted in the right lung (maximum standardized uptake value [SUV<sub>max</sub> = 3.1]). However repeat study after adequate preparation and 6 h of fasting shows (b) increased F-18 fluoro-deoxy-glucose (FDG) uptake in the right lung lesion (SUV<sub>max</sub> = 12). Learning point in this image is that inadequate fasting increases insulin mediated muscle uptake with a decrease in tumoral uptake of F-18 FDG that might lead to false negative interpretations and inadequate baseline study to evaluate response at a later date. This image highlights the importance of adequate fasting prior to F-18 FDG PET/computed tomography scan