IgG4相关肾病的CT影像特征

目的 探讨IgG4相关肾病CT影像特点。方法 回顾性分析36例IgG4相关肾病患者,其中累及肾实质26例,累及肾盂10例,双肾发病或多病灶24例,单病灶12例,分析其影像学特征,包括临床病史、病灶的大小、形态、密度、分布范围、增强后强化的特点、峰值、肾盂受累情况、有无淋巴结肿大等。结果 IgG4相关肾病具有较特异的临床及影像学特征,虽然肾脏或肾盂受累,但无肾积水及血尿等恶性肿瘤常见临床表现,边界多清楚完整,其具有典型的持续性渐进性强化的特点,峰值多位于实质期及排泄期,病变无液化、坏死、囊变及钙化等影像学表现,即使肾盂受累明显而且病灶较大也无周围肾实质侵犯,肾盂形态依然存在,管壁光整,无周围淋巴结增大。结论 IgG4相关肾病CT影像与肾脏恶性肿瘤相似,结合其临床、CT影像和血IgG4相关实验室检查,可以做出明确诊断,避免不必要手术。

Computed Tomography Imaging Features of IgG4-related Nephropathy

Objective To investigate the computed tomography(CT)imaging features of IgG4-related kidney disease(IgG4-RKD).Methods The clinicopathological and imaging data of 36 IgG4-RKD patients(including 26 cases of renal parenchyma,10 cases of renal pelvis,24 cases of double kidney or multiple lesions,and 12 cases of single focus)were retrospectively analyzed.Results IgG4-RKD had specific clinicopathological and imaging features.Although the kidney or renal pelvis was involved,there were no common clinical manifestations of malignant tumors such as hydronephrosis and hematuria.The boundary was clear and complete,and it had typical characteristics of continuous progressive enhancement.The peak value was mostly in the solid and excretory phase,and there were no imaging manifestations such as liquefaction,necrosis,cystic degeneration,and calcification.Even if the renal pelvis was obviously involved and the focus was large,there was no invasion of the peripheral renal parenchyma,the shape of the renal pelvis still existed,the wall was smooth,and there was no enlarged peripheral lymph nodes.Conclusions CT images of IgG4-RKD are similar to those of renal malignant tumors.Based on clinicopathological features,CT findings,and blood IgG4-related tests,a definite diagnosis can be made and unnecessary operation can be avoided.