01-06-2009 | Original Article
Significance of 18F-2-deoxy-2-fluoro-glucose accumulation in the stomach on positron emission tomography
Published in: Annals of Nuclear Medicine | Issue 4/2009
Login to get accessAbstract
Objective
To explain the accumulation of 18F-2-deoxy-2-fluoro-glucose (18FDG) on positron emission tomography (PET) in the stomach and differences in its pattern, we focus on the accumulation pattern in association with endoscopic findings of the gastric mucosa and Helicobacter pylori (Hp) infection.
Methods
Of 599 cases undergoing 18FDG-PET examinations, we retrospectively analyzed the pattern of 18FDG accumulation in the stomach, findings of upper gastrointestinal endoscopy, and Hp infection. The pattern of 18FDG accumulation was classified into three groups: localized accumulation only in the fornix (Group A, 32 patients), diffuse accumulation throughout the entire stomach (Group B, 49 patients), and no accumulation (Group C, 191 patients).
Results
Regarding the relation between Hp infection and 18FDG accumulation, Hp infection was positive in 56.3% of Group A, 73.5% of Group B, and 24.1% of Group C, with significant differences (p < 0.001). Regarding the relation between 18FDG accumulation and gastric mucosal inflammation, when Groups A and B were compared with Group C, nearly half of the cases in the former groups had papular redness with a significantly higher frequency of redness and erosion. Three cases found to have malignant tumor were limited to the former groups. One MALT lymphoma case was also found in the same group. Accumulation of 18FDG largely corresponded to mucosal inflammation including superficial gastritis and erosive gastritis, and therefore the main cause of non-specific 18FDG accumulation was considered to be inflammatory mucosa (mainly redness). The accumulation pattern was not associated with atrophic changes of the gastric mucosa or with Hp infection, but with mucosal inflammatory changes, including redness and erosion localized to the fornix.
Conclusions
Accumulation of 18FDG in the stomach suggests a high probability of the presence of inflammatory change in the gastric mucosa forming a background for the development of cancer or malignant lymphoma, and thus requires further endoscopic examinations.