【摘要】 目的探讨松果体区肿瘤的MR影像特征及其与病理组织学类型的相关性。方法 20例经手术病理证实的松果体区肿瘤患者,其中,生殖细胞瘤8例,松果体细胞瘤5例,星形细胞瘤3例,脑膜瘤2例以及畸胎瘤2例均经MR平扫与增强扫描。结果生殖细胞瘤在T1WI上呈等或稍低信号,在T2WI上呈高信号,增强后瘤体均匀强化。典型的"蝴蝶征"见于8例中的2例。松果体细胞瘤在T1WI上呈等或低信号,在T2WI上呈稍高信号。瘤内或瘤周钙化见于5例中的3例。星形细胞瘤在T1WI上呈等、低混杂信号,在T2WI上呈高信号,并伴发肿瘤坏死、液化。脑膜瘤在T1WI上呈等信号,在T2WI上呈高信号,增强后肿瘤实质显著均匀强化。畸胎瘤呈囊实性团块,瘤内脂肪成分在T1WI、T2WI上均呈高信号。结论松果体区肿瘤随其病理组织学类型而有各自的特征性MR影像表现,有助于对其作出正确诊断与鉴别诊断。更多还原

【Abstract】 Objective To study the MRI features of pineal region tumors(PRTs) and their correlation with histopathologic types.Methods Twenty patients with surgically and pathologically proved PRTs which comprised germinoma(n=8),pinealoma(n=5),astrocytoma(n=3),meningioma(n=2) and teratoma(n=2) underwent precontrast and postcontrast MR scans.Results Germinoma lesions were isointensity or hypointensity on T1WI and hyperintensity on T2WI.Following enhanced scans,the tumors were obviously homogeneous enhancement.The typical "butterfly sign" was found in 2 of 8 cases.Pinealoma lesions were isointensity or hypointensity on T1WI and slight hyperintensity on T2WI.Intratumoral or peritumoral calcification was found in 3 of 5 cases.Astrocytoma lesions were iso-low-heterogeneous signals on T1WI and associated with tumoral necrosis and liquefy.Meningioma lesions were isointensity on T1WI and hyperintensity on T2WI.Following enhanced scans,tumoral solid parts were significantly homogeneous enhancement.Teratoma lesions appeared as mass shadows with cystic and solid components.Intratumoral fat components were always hyperintensity either on T1WI or T2WI.Conclusion PRTs with their histopathologic types have respective MR features which are helpful to correctly diagnose and differentiate them.更多还原