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目的探讨MRI对眼眶横纹肌肉瘤(rhabdom yosarcoma,RMS)的诊断价值。资料与方法回顾性分析28例经手术病理证实的眼眶RMS患者的MRI表现。结果 28例中胚胎型21例,未作病理分型7例。均行MRI。病变位于肌锥内间隙23例,肌锥外间隙5例。11例原发,17例术后复发。肿瘤形态多较规则,边界尚清。21例病变较大,挤压视神经及眼球,造成视神经及眼球移位。T1WI上24例较眼外肌呈中等偏低信号,4例呈稍高信号。T2WI上信号强度略高于眼外肌,26例低于眶内脂肪。脂肪抑制序列上呈高信号。结论眼眶RMS在MRI上有一定的信号特点,而且MRI可以清楚地显示病变范围及其与眶内周围组织的关系,对于眼眶RMS的诊断有重要意义。
Objective To investigate the diagnostic value of MRI for rhabdomyosarcoma (RMS). Materials and Methods MRI findings of 28 patients with orbital RMS confirmed by surgery and pathology were retrospectively analyzed. Results Among the 28 cases, 21 were embryo type and 7 were not pathological type. All patients underwent MRI. Twenty-three cases were located in the muscle conus interspace, and 5 cases were external cone of muscle. 11 cases of primary, 17 cases of recurrence. Tumor morphology more rules, the boundary is clear. 21 cases of larger lesions, squeeze the optic nerve and eye, causing optic nerve and eyeball shift. 24 cases of T1WI compared with extraocular muscle was moderate lower signal, 4 cases showed a slightly higher signal. Signal intensity on T2WI was slightly higher than that in extraocular muscles, 26 cases below orbital fat. Fat-suppressed sequence showed high signal. Conclusions The orbital RMS has certain signal characteristics in MRI. MRI can clearly show the extent of the lesion and its relationship with the orbital tissue, which is of great significance for the diagnosis of orbital RMS.