课件：中枢神经系统影像.ppt

椎管内肿瘤 髓内肿瘤: 室管膜瘤、星形细胞瘤、血管网状细胞瘤 髓外硬膜下肿瘤：神经源性肿瘤、脊膜瘤 髓外硬膜外肿瘤：转移瘤、淋巴瘤 髓外硬膜下肿瘤extramedullary intradural tumor M R 诊断要点： 1、脊髓受压，向患侧移位。 2、患侧蛛网膜下腔增宽，健侧变窄。 3、病变范围局限，边界清晰。 4、T1及T2呈等信号，有明显强化 THANK YOU SUCCESS * * 可编辑 。 2.6 Traumatic SAH in the sulci,interhemispheric fissure 9.10 Communicating hydrocephalus Delayed Hemorrhage,several hours or days after head injury 8hour later AADA CDDCB ECAE 答案: AADA 答案：CDDCB 答案：ECAE 颅内肿瘤/椎管内肿瘤影像诊断Intracranial and intraspinal tumor radiology 肖叶玉 汕大医学院第二附属医院放射科 脑肿瘤/椎管内肿瘤Intracranial and intraspinal tumor CT：With or without tumor，localization and qualitative diagnosis Advantages of MRI：No bone artifacts, multi-dimensional sections scanning, a variety of imaging parameters 。Therefore, a more accurate positioning and characterization of the tumor Imaging signs of intracranial tumors Direct signs ： 1）The site of tumor 2）The density (signal) of tumor 3） The number, size, shape and edge of tumor 4）The enhancement extent and morphology of tumor Indirect signs ： 1）Peritumoral edema 2）Changes in skull The expand and damage internal auditory canal can be seen in acoustic neuroma The skull corresponding shows thickening of meningiomas 星形细胞瘤（astrocytic tumors) Astrocytic tumors is the most common primary intracerebral tumours Astrocytoma in adults more common in Supratentorial, children more common in infratentorial cerebellar Astrocytoma mainly located in the white matter, grading Ⅰ-Ⅳ Tumor localization signs and symptoms of intracranial hypertension, Epilepsy 脑内肿瘤 直接征象 1）好发部位:白质 2）密度（信号）：Ⅰ级低密度，Ⅱ~Ⅳ级高低混杂密度的囊性肿块，可有钙化与瘤内出血、坏死、囊变 3）数目、大小、形态和边缘： Ⅰ级边界清楚， Ⅱ~Ⅳ级边界不清，形态不规则 4）增强的程度及形态： Ⅰ级不强化， Ⅱ~Ⅳ级呈不规则环形伴壁结节强化 间接征象 1）瘤旁水肿：明显 2）颅骨变化：常无 星形细胞瘤 astrocytic tumors Ⅰ~Ⅳ grade 脑膜瘤Meningioma Meningioma originated from arachnoid granulations cap cells, connected with the dura Most tumors occur outside the brain, some can occur even in ventricle A typical site followed by frequency of occurrence : 脑膜瘤影像特征总结 脑外