Radiology Viva Cases # 357- 366 | Brain Exam Cases Part -5
Автор: Radiology Made Easy
Загружено: 2023-06-01
Просмотров: 354
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Medulloblastomas are the second most common malignant brain tumor of childhood, with only high-grade gliomas being more common. They most commonly present as midline masses in the roof of the 4th ventricle with associated mass effect and hydrocephalus. Treatment typically consists of surgical resection, radiation therapy, and chemotherapy, with the prognosis strongly influenced by surgical resection, the presence of CSF metastases at the time of diagnosis, molecular and histological features and expression of the c-erbB-2 (HER2/neu) oncogene.
Ependymomas represent a relatively broad group of glial tumors most often arising from the lining of the ventricles of the brain or the central canal of the spinal cord. They account for ~5% of all neuroepithelial neoplasms, ~10% of all pediatric brain tumors and up to 33% of brain tumors occurring in those less than 3 years of age.
Pilocytic astrocytomas, also known as juvenile pilocytic astrocytomas, are circumscribed astrocytic gliomas that typically to occur in young patients. The majority of sporadic pilocytic astrocytomas arise from the cerebellum, whereas in the setting of neurofibromatosis type 1, they often involve the optic chiasm and pathway. In adults, they are typically supratentorial.
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