Abstract
Magnetic resonance (MR) imaging is becoming a primary modality for evaluating the mediastinum. MR affords multiplanar imaging capabilities without exposing patients to ionizing radiation. The inherent contrast effect of different mediastinal tissues sharply delineates anatomic structures on MR images without contrast enhancement. Gradient-echo and phase-mapping techniques permit noninvasive qualitative and quantitative assessment of mediastinal blood flow. High soft tissue contrast and flow analysis capabilities make MR imaging a valuable modality for evaluating mediastinal vascular disorders. Various mediastinal tumors and their extent are best identified by the use of T1-weighted, T2-weighted, and gadolinium-enhanced images. Both primary and secondary chest wall lesions may be assessed with standard spin-echo MR images. Complex pleuroparenchymal lesions may be evaluated by means of a multiplanar approach and modified pulse sequences. This article addresses the technical parameters governing MR imaging of the mediastinum and describes MR characteristics of various pathologic conditions.
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