The brachial plexus is a complex network of nerve roots that supplies the upper limb. The brachial plexus can be involved by many disease entities called brachial plexopathies. Brachial plexus lesions can be divided into two main groups- traumatic and non-traumatic. In clinical practice each group accounts for approximately 50% of cases. Many imaging modalities have been used for the evaluation of brachial plexopathies. The aim of this study is to evaluate the clinical utility and diagnostic accuracy of Magnetic Resonance Imaging in the diagnosis of brachial plexus lesions in patients with symptomatic brachial plexus injuries. The study included 61 patients that were classified according to the etiology of brachial plexus injury into 3 groups; a) obstetric group, b) post-traumatic group, and c) postradiotherapy group. The study concluded that MRI is considered now the imaging modality of choice in the overall evaluation of brachial plexopathies as it is not invasive and demonstrates preganglionic and postganglionic lesions. Inspite of being more sensitive for preganglionic lesions, CT myelography should be preserved for the preoperative assessment. Clinical assessment and electrodiagnostic studies are also important.