MR imaging of the brachial plexus.

The characterization of brachial plexus (BP) pathology can be perplexing for the radiologist, especially due to varying combination of sensory and motor symptoms depending on the extent of disease and the level of disease process. Localization can be difficult due to inherently complex anatomy of the BP complicated by a variety of benign and malignant disease processes. Infrequently requested imaging of the BP, can be a challenge to both the novice and experienced reader. Invasive methods of diagnosis, such as biopsy, yield variable results and carry the risk of causing permanent sensory and/or motor deficit and may also cause long-term neuralgic pain. The purpose of this article is to provide a straightforward review of BP pathology as seen by conventional magnetic resonance imaging and to illustrate the value of this noninvasive technique in guiding management.