继发性噬血细胞性淋巴组织细胞增多症^18F-FDG PET/CT显像特点

目的 探讨继发性噬血细胞性淋巴组织细胞增多症（sHLH）的^18 F-FDG PET/CT显像特点.方法 回顾性分析南京医科大学第一附属医院2008年1月至2012年6月初诊的31例（男18例,女13例,平均年龄42岁）sHLH患者临床资料及^18F-FDG PET/CT显像资料,根据病因将患者分为肿瘤相关HLH（MAHLH）组（13例）、感染相关HLH（IAHLH）组（13例）及风湿病相关HLH（RAHLH）组（5例）,分别统计各组病灶FDG摄取情况和SUVmax.采用单因素方差分析及两样本t检验对各组SUV max进行比较.结果 23例患者脾肿大合并^18F-FDG摄取增高,RAHLH组、IAHLH组及MAHLH组对应例数分别为4、9和10例,对应脾脏SUVmax分别为3.16±0.61、5.67±3.37和6.04±3.06,差异无统计学意义（F=1.051,P＞0.05）.15例淋巴结增大合并^18F-FDG摄取增高：其中IAHLH组（8例）与MAHLH组（7例）肿大淋巴结SUVmax分别为5.35±1.69和10.14±5.24,差异有统计学意义（t=-2.456,P＜0.05）.17例骨髓^18F-FDG摄取增高：其中RAHLH组1例,SUVmax为4.6;IAHLH组（7例）与MAHLH组（9例）骨髓SUVmax分别为5.31±2.05和6.36±3.71（t =-0.670,P＞0.05）.10例肝脏体积增大的患者中,4例合并^18F-FDG摄取增高,SUVmax为4.9～10.2.MAHLH组、IAHLH组及RAHLH组SUVmaw分别为8.15±4.38、5.62±2.45和3.02±1.31,MAHLH最高（F=9.123,t=2.562、5.236、3.030,均P＜0.05）.结论 RAHLH多表现为脾脏肿大伴^18F-FDG摄取轻度增高,IAHLH和MAHLH多表现为脾脏肿大,侵犯淋巴结及骨髓;且MAHLH FDG摄取最高.上述^18F-FDG PET/CT显像特点有助于对该病的准确诊断.

^18F-FDG PET/CT imaging findings of secondary hemophagocytic lymphohistiocytosis

Objective To summarize the imaging manifestations of ^18F-FDG PET/CT in patients with secondary hemophagocytic lymphohistiocytosis （sHLH）.Methods From January 2008 to June 2012,31 patients （18 males,13 females,average age：42 years） with sHLH were enrolled.All patients were divided into 3 groups：malignancy associated HLH （MAHLH） group （n =13）,infection associated HLH （IAHLH） group （n =13） and rheumatosis associated HLH （RAHLH） group （n =5）.They all underwent 18F-FDG PET/CT and SUVmax of lesions in each group was calculated.One-way analysis of variance and two-sample t test were used to analyze the SUVmax.Results Twenty-three patients were found splenomegaly with high FDG uptake,including 4 RAHLH patients,9 IAHLH patients and 10 MAHLH patients.The splenetic FDG uptake values （SUVmax） of RAHLH,IAHLH and MAHLH groups were 3.16±0.61,5.67±3.37 and 6.04±3.06,respectively （F=1.051,P〉0.05）.The SUVmax of enlarged lymph nodes in IAHLH （n=8） and MAHLH groups （n =7） was 5.35± 1.69 and 10.14±5.24,respectively （t =-2.456,P〈0.05）.Increased uptake in bone marrow was found in 17 patients,including 1 RAHLH patient,7 IAHLH patients and 9 MAHLH patients.The SUVmax of bone marrow in IAHLH and MAHLH patients was 5.31±2.05 and 6.36± 3.71 respectively （t=-0.670,P〉0.05）.There were 10 cases of hepatomegaly,but only 4 of them had intense FDG uptake （SUVmax 4.9-10.2）.The SUVmax of RAHLH,IAHLH and MAHLH groups was 3.02± 1.31,5.62±2.45 and 8.15±4.38,respectively （F=9.123,t=2.562,5.236,3.030,all P〈0.05）.Conclusions RAHLH mostly showed splenomegaly with high FDG uptake,IAHLH and MAHLH both showed splenomegaly with lymph node and bone marrow invasion.The SUVmax of MAHLH was the highest.^18F-FDG PET/CT imaging manifestations of sHLH may be helpful to improve the diagnostic accuracy.