局灶型Castleman病的MDCT和MRI表现特征及其病理学基础

为了探讨局灶型Castleman病(CD)的多层螺旋CT(MDCT)和磁共振成像(MRI)表现特征及其病理学基础,收集经手术病理证实的13例患者的临床资料,回顾分析其MDCT和MRI表现特征。所有患者均行MDCT平扫,11例行MDCT增强扫描,而另外2例行MRI平扫和增强扫描。13例患者共有14个病灶且均为透明血管型,MDCT平扫病灶均为等密度软组织肿块影;4个病灶中心有钙化,其中斑点状钙化2个,分支放射状钙化及分支放射状钙化伴病灶边缘弧形钙化各1个。MDCT增强扫描均有明显强化,其中均匀强化11个,另外3个为不均匀强化,表现为中心有星芒状低密度无强化区2个,局灶性无强化影1个;病灶周围显示较多迂曲血管影8个。行MRI扫描者T1WI信号稍高于肌肉,T2WI为明显高信号,增强亦有明显强化;同时右肩部病灶中心显示流空血管影,增强显示粗大的供血动脉及周边许多小血管影。总之,局灶透明血管型CD在MDCT或MRI上多表现为孤立性软组织肿块,以明显均匀强化为主、少数伴有不规则钙化或星芒状瘢痕为特征。

MDCT and MRI findings of localized Castleman's disease and its pathological basis

To evaluated the multi-detector CT (MDCT) and magnetic resonance imaging (MRI) features of localized Castleman's disease (CD), we retrospectively analyzed the clinical data, MDCT and MRI findings of 13 patients with CD proved pathologically. All patients underwent plain MDCT scan, 11 underwent enhanced CT, and 2 MRI. 14 lesions were detected in the 13 patients, and all of them were hyaline-vascular type (HV-CD) histopathologically. On plain MDCT scans, all lesions were homogeneously attenuated soft tissue mass; intra-tumoral calcification with punctate and "arborizing" patterns was detected in the center of 2 lesions each. Of the patients with enhanced MDCT, all lesions showed obvious enhancement homogeneously except two lesions with central stellate and 1 lesion with dotted low attenuation. Tortuous vessels could be revealed at the periphery of 8 lesions. Of the 2 patients with MRI, the lesions showed slightly hyper-intensity on T1WI, hyper-intensity on T2WI and marked homogenous enhancement. In addition, one of them showed signal void appearance in the center on unenhanced MRI and large supplying artery with tortuous vessels at the periphery on enhanced MRI. In a word, Localized HV-CD usually demonstrated as soft tissue mass with obvious enhancement on MDCT and MRI. Central stellate area of low attenuation and calcification with punctate or "arborizing" pattern may also be present.