Magnetic resonance imaging in the evaluation of intracranial tumors of childhood.

Magnetic resonance imaging (MRI) is a noninvasive imaging technique that demonstrates intracranial anatomy without the use of ionizing irradiation and intravenous contrast agents. Image quality is dependent on various factors, including field strength, scanning sequence, and imaging time. Although there is currently no concensus as to how to visualize intracranial lesions optimally, MRI has already been shown to be sensitive in the detection of brain tumors. It can detect many different types of tumors; however, its specificity is unclear. Intracranial tumor extent is extremely well-demonstrated by MRI. The advantages and disadvantages of MRI compared with computerized tomography are reviewed.