眼眶植物性异物的影像学表现

目的分析眼眶植物性异物的影像学表现,为临床治疗提供帮助。设计回顾性病例系列。研究对象手术证实眼眶内植物性异物患者10例。方法对10例眼眶植物性异物患者行CT检查,轴位CT扫描5例、冠位CT扫描1例,轴位 冠位CT扫描4例。2例行MRI。对上述病例的影像学表现进行回顾性分析。主要指标眼眶植物性异物的急性期、亚急性期和慢性期的CT和MRI表现。结果急性期2例CT显示植物性异物为低密度,周围无软组织增生;亚急性期4例(包括1例上述急性期病例转为亚急性期者)CT显示植物性异物为低密度伴周围炎性软组织增生;慢性期6例(包括1例上述急性期病例转为慢性期者)CT显示植物性异物为高密度机化影,周围有炎性肉芽肿包裹。1例亚急性期异物MRI在T_1WI、T_2WI显示偏低信号,1例慢性期肉芽肿在T_1WI、T_2WI显示为中等信号。结论CT扫描对于急性期、亚急性和慢性期植物性异物均能明确诊断,MRI没有明显优势。(眼科,2007,16:323-325)

CT and MRI appearance of intraorbital vegetable foreign body

Objective To analyse the imaging appearance of intraorbital vegetable foreign bodies.Design Retrospective case series.Participants 10 cases of intraorbital vegetable foreign bodies were confirmed by surgery.Methods Imaging of 10 cases of in- traorbital vegetable foreign bodies were reviewed.In 10 patients with CT scan,there were 5 cases with axial CT,1 case with coronal CT,4 cases with axial and coronal CT and 2 cases with MRI scan.Main Outcome Measures CT and MRI characteristics of intraor- bital vegetable foreign bodies in the acute stage,subacute stage and chronic stage.Results 2 cases of intraorbital vegetable foreign bod- ies showed low density with CT in the acute stage,without soft-tissue around;4 cases of intraorbital vegetable foreign bodies showed low density with CT in the subacute stage,surrounded by soft-tissue;6 cases of intraorbital vegetable foreign bodies showed high density with CT in the chronic stage,surrounded by granuloma.1 case in the acute stage showed low-signal in both T_1WI and T_2WI,1 case with granuloma in the chronic stage showed moderate-signal in both T_1WI and T_2WI.Conclusions Intraorbital wooden foreign body can be diagnosed with CT in the acute stage,subacute stage and chronic stage,MRI is not prior to CT.(Ophthalmol CHN,2007,16:323-325)