Spinal synovial cyst (ganglion). Review and report of a case presenting as a retropharyngeal mass.

A synovial cyst (ganglion) of the anterior longitudinal ligament of the cervical spine, which presented as a retropharyngeal mass, is reported. Synovial cysts occur at various spinal sites and should always be included in the differential diagnosis of intraspinal extradural and paraspinal cysts.