Tumor Systematic Approach脑肿瘤MR诊断英文版ppt课件.pptVIP

Brain Tumor - Systematic Approachby Robin Smithuis and Walter Montanera河南省人民医院放射科 高明 译讲; Introduction Incidence of CNS tumors Age distribution Tumor spread Intra- versus Extraaxial Midline crossing Multifocal disease Cortical based tumors CT and MR Characteristics ;Fat - Calcification - Cyst High on T1 Low on T2 Diffusion weighted imaging Perfusion Imaging Enhancement Differential diagnosisfor specific;anatomic area Skull base Sella/suprasellar Cerebello-pontine angle Pineal region Intraventricular 4th ventricle Tumor Mimics ;;;;;;Schwannoma located in the cerebellopontine angle (CPA)with typical signs of an extraaxial tumor ;Meningioma with a broad dural base and a dural tail ， hyperostosis in the adjacent bone ， enhances homogeneously ， no blood-brain-barrier;Melanoma metastasis with gray matter on the anteromedial side of the lesion (red arrow) ， intra-axial. ;Ependymoma with extension to the cerebellopontine angle (blue arrow) and into the foramen magnum (red arrow) or to the cisterna magna ;To assess the extent of a tumor. An extra-axial tumor in the region of the left cavernous sinus with homogeneous enhancement and a broad dural tail.This is typical for a meningioma. ;Actual extent of this tumor is greater than expected. The tumor is situated in the pterygopalatine fossa and extends into the orbit. It also spreads anteriorly into the middle cranial fossa. ;Consideration for the effect on the surrounding structures . Primary brain tumors are derived from brain cells and often have less mass effect for their size than you would expect, due to their infiltrative growth . There is no enhancement so this would probably be a low-grade astrocytoma ;;The ability of tumors to cross the midlineGlioblastoma multiforme (GBM) frequently crosses the midline by infiltrating the white matter tracts of the corpus callosum. Radiation necrosis can look like recurrent GBM and can sometimes cross the midline. Meningioma is an extra-axial tu