PET/CT诊断恶性淋巴瘤对肝和(或)脾的侵犯

摘要

目的 根据恶性淋巴瘤侵犯肝和(或)脾的PET/CT影像学表现,总结肝和(或)脾内病变累及的特点,为以后正确诊断提供依据.方法 41例累及肝和(或)脾的恶性淋巴瘤患者,共进行52例次全身PET/CT检查,追踪分析这些患者的临床资料及PET/CT影像表现,以期发现恶性淋巴瘤侵犯肝和(或)脾的规律.所有病例均由组织病理学检查证实,其中包括非霍奇金淋巴瘤(NHL)38例,霍奇金淋巴瘤(HL)2例,胃黏膜相关淋巴组织淋巴瘤1例.静脉注射18F-脱氧葡萄糖(FDG) 222～555 MBq 1h后行PET/CT显像.测定肿瘤体积和平均标准摄取值(SUVavg),并与PET/CT检查中单纯CT平扫(41例)结果进行对照.结果 淋巴瘤侵犯肝和脾的表现形式明显不同.(1)有30例(30/41)患者肝受累及,肝侵犯以肝实质内结节或肿块状病变和肝门部淋巴结受累,并形成体积较大的肿块压迫和侵犯邻近的肝实质最为常见.(2)有23例(23/41)患者脾受侵犯,脾侵犯以脾体积明显增大,PET显示整个脾代谢弥漫性均匀性增高为主要表现.(3)除全身淋巴结组织和肝、脾侵犯以外,还有一些少见部位的累及:肺内13例、骨皮质和骨髓内12例、胃9例、胸膜6例、皮下软组织5例等.结论 PET/CT可以较准确地发现恶性淋巴瘤对肝、脾的侵犯,并准确显示病灶大小、形态和分布,为淋巴瘤的诊断和准确分期提供帮助.%Objective The detection of malignant lymphoma with invasion in liver and spleen using PET/CT has not been well documented in the literature. This study aimed to investigate the usefulness of PET/CT in this regard and to compare it with plain CT. Methods Forty-one pathologically confirmed malignant lymphoma patients with liver and spleen invasion were recruited into this study. Among all patients, there were 38 non-Hodgkin's lymphoma (NHL), 2 Hodgkin's lymphoma (HL) and 1 gastric mucosa associated lymphoma. PET/CT imaging was recorded 1h after injection of 296～444 MBq 18F-fluorodeoxyglucose (FDG). Results (1) There were 30(30/41) patients with liver invasion, including hepatic nodules, mass and portal nodes. The mass was large to invade surrounding liver parenchyma. (2) There were 23(23/41) patients with spleen invasion. The spleen was enlarged and demonstrated diffused hyper-metabolism. (3) Other invasion included: lung (n=13), cortical bone and marrow (n=12), stomach (n=9), pleural (n=6), and subcutaneous soft tissue (n=5) and so on. Conclusion PET/CT could accurately diagnose the invasion in liver and spleen of malignant lymphoma, which was of potential role on the diagnosis and staging of lymphoma.