Central nervous system 影像课件.ppt

Multiforme Glioblastoma(GBM) T2WI T1WI Left thalamus GBM. 63y, male Same case Contrast T1WI Irregular ring enhancement cystic metastases Primiary cancer: lung carcinoma lesion in left occipital lobe Contrast metastases Disproportional white matter edema(Primiary cancer: colon carcinoma) Contrast T1WI T1WI T2WI mass effect: lateral ventricle midline structure shifted （cerebral falx） metastases T1WI T2WI T2flair Contrast T1WI multiple lesions： right part of the pons left cerebellum Same case(breast carcinoma) T2WI T1WI contrastT1WI T2flair left right parietal lobe frontal lobe another level Metastasized to meninges Contrast T1WI cerebral falx大脑镰 Contrast T1WI left occipital lobe character of metastases: 1.primary malignant tumor 2.multi-lesions ---small ones: solid nodules( homogeneous enhancement) big onces:center necrosis(ring enhancement) 3.small tumor with inappropriate edema 4.located in cortex / subcortex area ( embolus癌栓 easily blocked here ) meningeoma Meningeoma: isointensity tumor. Calcifications:low intensity in center T1WI T2WI lesion in suprasellar cistern Same case Obviously homogeneous enhancement, calcification no enhancement. （dural tail sign） Contrast T1WI meningeoma suprasagital Meningeoma: low intensity and Homogenous enhancement Contrast T1WI T1WI T2WI Same case Contrast T1WI Dural tail sign(arrow) acoustic tumor Right acoustic tumor: no enhancement of cystic change T1WI Contrast T1WI Same case abnormal acoustic nerve T2WI pituitary tumor Optic chiasm was pulled up by tumor. cystic change of tumor T2WI T1WI Same case Right carotid artery was surrounded by tumor （flowing void effect） Contrast T1WI hemorrhage of HBP hematoma in left basal ganglia:high density intracerebral hemorrhage MRI MRI subacute hematoma in right temporal lobe T1WI T2WI MRI (same case) 梯度回波序列Gradient echo sequence(iron-sensitive): low intensity DWI intracerebral infarction MRI blurring effect（模糊效应）：2-3w after farction happened, the lesion be