Metastatic Intra-Axial Neoplasia

The role of MRI imaging in the metastatic work-up is to detect the spread of tumor to the brain parenchyma, and define the location. Intravenous contrast (gadolinium-DTPA) provides the greatest sensitivity for detecting brain lesions and is almost always indicated except when there is no intravenous access. This unit presents a for imaging intra-axial brain metastases and specific modifications are discussed for the case of metastatic brain tumors demonstrating evidence of hemorrhage. The sequences described in this unit are based on 1.5 T scanner (Echospeed GE Medical Systems, Milwaukee, Wisconsin), but can be expected to be equally applicable to other field strengths and scanners from other manufacturers.