目的:分析胃淋巴瘤的18 F-FDGPET/CT影像学特点,探讨其在胃淋巴瘤的诊断、鉴别诊断和病情评估中的价值.方法:17例经胃镜活检病理证实的胃淋巴瘤患者.包括13例弥漫性大B细胞淋巴瘤,3例粘膜相关淋巴组织B细胞淋巴瘤和1例NK/T细胞淋巴瘤.均在治疗前行PET/CT显像.结果:胃淋巴瘤的PET/CT表现以不同形式的胃壁增厚和显著增高的FDG代谢为主要特征,6例呈Ⅰ型表现(胃壁弥漫性增厚伴FDG代谢显著增高),7例呈Ⅱ型表现(胃壁节段性增厚伴FDG代谢显著增高),3例呈Ⅲ型表现(胃壁局限性增厚伴FDG代谢增高),1例呈Ⅳ型表现(胃壁多发结节样增厚伴FDG代谢串珠样增高);PET/CT评价4例仅累及胃壁,3例累及胃壁和淋巴结,10例累及胃壁、淋巴结和其它脏器.结论:胃淋巴瘤18F-FDG PET/CT表现以Ⅰ型和Ⅱ型更为多见;18F-FDG PET/CT有助于淋巴瘤的诊断和病情全面评估.%Objective: The imaging characteristic of 18F-FDG PET/CT in patients with gastric lymphoma were investigated. The aim of this study was to approach the adequacy of PET/CT in diagnosis, differentiation and evaluating patient's condition of gastric lymphoma. Methods: Seventeen newly diagnosed patients (13 males and 4 females. age 22～79 years)with gastric lymphoma underwent 18 F-fluorodeoxyglucose ( FDG) PET/CT examination before trearment. These all lesions were histopathologically confirmed by cndoscope, including 13 cases of diffused large B cell lymphoma (DLBCL), 3 cases of mucosa associated lymphoid tissue lymphoma (MALT) and 1 case of NK/T cell lymphoma. Results : The PET/CT findings of gastric lymphoma showed the characteristic of diverse thiekened gastric wall with significantly high FDG uptake.There were 6 in type I (diffuse thickened gastric wall with significanrly high FDG uprake) . 7 in type Ⅱ (segmental thickened gastric wall with significantly high FDG uptake) , 3 in type Ⅲ (local thickened gastric wall with high FDG uprake)and 1 in type IV (multiple nodular thickened gastric wall with string-of-beads high FDG uptake). On PET/CT images of the seventeen parients, 4 cases displayed only stomach involvement. 3 cases extra-lymph nodes involvement, IO cases extra lymph nodes and organs involvement. Conclusion: Type I and type Ⅱ findings of PET/CT are more often seen in gastric lymphoma. PET/CT is favorable to its diagnosis and overall assessment before treatment.
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