► large orbital optic glioma in 5-year- old child with neurofibromatosis type 1.
► Germinoma of the pineal region obstructing the third ventricle and causing hydrocephalus.
► choroid plexus papilloma. ► After contrast medium administration, the tumor enhanced homogeneously. The vascular pedicle leading to the tumor is well appreciated
► Preoperative image made without (A) and with (B) gadolinium enhancement shows fourth-ventricular invasion of an ependymoma in a child. ► C. gadolinium- enhanced image shows the tumor protruding from the foramen of Luschka into the cerebellopontine angle on the right. ► D. image made postoperatively confirms complete resection
► Computed tomography of a tumor presenting with acute hemorrhage. ► anaplastic mixed oligoastrocytoma.
► A. non–contrast- enhanced CT scan of a cystic craniopharyngioma This large tumor is almost isodense with the surrounding brain tissue and is poorly defined. Two calcified areas on the left side of the cyst wall are seen, suggesting the diagnosis. ► B. Axial scan following contrast enhancement. The tumor is well defined, and the cyst wall and calcifications are seen.
► Coronal T1-weighted magnetic resonance images show a parasagittal malignant meningioma (left) and its recurrence (right) 8 months after gross total resection and external beam radiation therapy.