Dynamic CSF flow study in the pathophysiology of syringomyelia associated with arachnoid cysts of the posterior fossa.

Two patients with posterior fossa arachnoid cysts associated with syringomyelia are discussed adding to the five cases already reported in the literature. The formation and progression of syringomyelia secondary to a posterior fossa cyst and its possible pathophysiology by dynamic CSF flow studies using magnetic resonance (MR) imaging are discussed and reviewed.