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/lp/wolters-kluwer-health/magnetic-resonance-imaging-of-pediatric-brain-tumors-JgUo7npAtG
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- ISSN
- 0899-3459
- eISSN
- 1536-1004
Abstract
When done with care, the visualization of brain tumors in children in most cases is easy. The challenge is in the ability to predict tumor type and grade. Slightly less than half of pediatric brain tumors are in the posterior fossa. Astrocy-tomas. medulloblastomas, and ependymomas account for 95f; of these tumors. Except for the large cysts and uniformly low Tl signal of pilocytic cerebellar astrocytomas, location and size arc more important than specific imaging characteristics in predicting tumor type. Supratentorial tumors are even more variable in magnetic resonance imaging characteristics, and it is difficult to tell benign from malignant tumor in many cases. Although gadolinium enhancement is useful in defining tumor borders, it is not a completely reliable indicator of malignancy. As in the posterior fossa, location is important in deciding which type of tumor is more likely. Suprasellar tumors are usually craniophary ngiomas. Small temporal lobe tumors are often oligodendrogliomas or gangliogliomas. Astrocytomas are the most common tumor, and also variable, although most benign astrocytomas are near the midline.
Journal
Topics in Magnetic Resonance Imaging – Wolters Kluwer Health
Published: Jan 1, 1993