It is well known that a traction injury of the brachial plexus may produce tears in the root sleeves resultingin pseudomeningocele, which are in most instances small in size. Giant pseudomeningocele, largerthan 8cm in length, is very uncommon, and have been described rarely in symptomatic cases. Seventeenyears old male complained of left upper limb weakness after motorcycle accident in our case. An electrodiagnosticstudy showed panplexopathy, preganglionic lesion on C5-C7 root level and postganglioniclesion on C8-T1 root level. Giant pseudomeningocle, which was 12.9 cm in length in the spinal canalalong the cervical spine was shown on magnetic resonance image executed one month after accident.
There were no symptoms due to intraspinal pseudomeningocele, except for symptoms due to brachialplexopathy. The authors report a first case of asymptomatic intra-spinal canal giant pseudomeningoceleafter brachial plexus injury.