目的研究眼眶淋巴管瘤的MRI表 现，提高术前诊断准确性。资料与方法 回顾性分析经手术病理证实的20例眼眶 淋巴管瘤的MRI表现特点。20例均行MRI扫 描，其中17例行动态增强扫描。结果 20 例中，5例为局限性淋巴管瘤，其中3例位 于肌锥外间隙，2例位于肌锥内间隙；单 囊型2例，多囊型3例。15例为弥漫性淋巴 管瘤，同时累及肌锥内外间隙，4例累及 眼睑，1例同时累及泪囊；单囊型2例，多 囊型13例。局限性淋巴管瘤表现为局部 类圆形肿块，边缘不规则或规则，边界 清晰；弥漫性淋巴管瘤表现为弥漫不规 则肿块，边界欠清晰，信号不均匀。MRI 表现：2例呈长T1长T2信号影(与眼外肌信 号相比)，信号均匀；18例呈高、等、低 混杂信号；增强扫描显示14例轻中度不均 匀强化，3例无强化。结论 MRI能准确显 示眼眶淋巴管瘤的部位及形态，尤其对肿 瘤内部信号特征的改变具有很高的诊断价 值，为临床手术方案的制定提供可靠依据。

Objective To investigate MR features of lymphangioma in fossa orbitalis, and to improve diagnostic accuracy per operation. Material and Methods MRI features of orbitalis lymphangioma in 20 cases were retrospectively analyzed. All the twenty cases performed MR examination, 17 among them performed dynamic enhancement. Results In all the twenty cases, 5 were localized lymphangioma with 3 in muscle cone outer space and 2 within muscle cone clearance. 2 were isolated cyst type. 3 were multiple cyst type. 15 were diffuse lymphangioma with involvement of muscle cone outer space and muscle cone clearance. Among them, eyelids were involved in 4 cases, and lacrimal sac was involved in one case. 2 were isolated cyst type, and 13 were multiple cyst type. Localized lymphangioma demonstrated located round-like mass, with regular or irregular well defined border. Diffuse lymphangioma demonstrated diffused irregular mass with ill defined border and inhomogenous signal. MR imaging characteristic: 2 case show homogenous long T1 and long T2 signal compared to extraocular muscles. 18 cases show high and low mixed signal. After contrast, 14 cases show slight to midrange enhancement. No enhancement in 3 cases. Conclusions MRI could accurately demonstrate the location and morphologic change of orbitalis lymphangioma with high diagnosis value，especially for internal signal alternation of the tumor, which provided reliable foundation for clinical operation projection.