眼眶淋巴管瘤的MRI诊断

MRI Diagnosis of Orbital Lymphangioma

目的 探讨眼眶淋巴管瘤的MRI表现与诊断价值。方法 对经手术病理证实的眶内淋巴管瘤患者 2 3例行MRI常规扫描与压脂增强扫描 ,分析其MRI表现特征。结果 根据MRI表现 ,淋巴管瘤可分为 3型 :①单囊型 :瘤体呈单发囊性肿块 ,长T1、长T2 信号 ,部分信号不均匀 ,水成像显示呈囊状高信号 ;②多囊型 :瘤体呈多个大小不等囊状灶 ,生长范围广泛 ,体积较大 ,部分囊腔内出血而形成巧克力囊肿 ,信号不均匀 ;③特殊部位型 :瘤体发生于结膜或眼球前方 ,肿块呈扁平状分布 ,略长T2 信号 ,境界较清 ,增强后轻度强化。结论 采用正确的MRI扫描方法 ,能明确显示淋巴管瘤的形态、范围与信号改变 ,结合三维重建图像 ,能为临床手术提供明确的定位与定性信息。

Objective To probe the value and representation of MRI in diagnosis of orbital lymphangioma. Methods Twenty three cases of lymphangioma confirmed by operation pathology, were scanned with common and post contrast MRI, and their special findings were analyzed. Results Lymphangioma was divided into three types by the appearance of MRI: ①Single cyst, the body of tumor was single cyst and long T 1 long T 2, part of it was uniform. MR hydrography show it was cystiform with high signal. ②Multicystic type, the tumor was multilocular cystic,with diffuse growth,large volume. Part of cystic cavity was chocolate cyst with hemorrhage. ③Special position, the tumor took place in conjunctiva or in the front part of eyeball,and tabular distributing with long T 2 signal,legible edge,a little enhancement on post contrast image. Conclusion MRI can display the modality,range and changes of signal of lymphangioma,and it can provide explicit localization and qualitative information for clinical operation.