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Brachial plexus birth injury. 6-month-old male with pseudomeningocele. Axial T2-weigted fat saturated FSE MRI image (a) demonstrates CSF intensity cyst in the left C6-7 neuroforamen. Intradural nerve roots are obscured by pulsation artifact. Axial FIESTA-C MRI image (b) shows the site of dural defect (thin arrow) and associated pseudomeningocele. The left sided intradural rootlets and exiting left C7 nerve root are absent, indicating avulsion.
