Ganglion cyst in the ligamentum flavum of the cervicothoracic junction.

A case of thoracic myelopathy secondary to a ganglion cyst originating from the ligamentum flavum at the C7 T1 level is reported. Magnetic resonance imaging (MRI) demonstrated an extradural oval mass at the C7/T1 level with thecal sac and cord compression. Surgical decompression and excision of the ganglion cyst resulted in a good neurologic recovery. Intraspinal ganglion cysts are rare entities. We review the literature and discuss the pathologic findings, pathogenesis and radiologic presentation of ganglion cysts.