An unusual presentation of thoracic cord compression by a dorsal arachnoid cyst in a 14-month-old boy. A discussion of the case and review of the literature.

Spinal arachnoid cysts are a rare cause of spinal cord compression in children and presenting symptoms may be subtle. We present a neurologically intact 14-month-old boy who presented with pain and postural irritability from a thoracic arachnoid cyst.