 Retroclival mass is better assessed on recent cervical spine MRI dated 3/25/2016. Images of the thoracic spine again demonstrate postoperative changes of laminectomy and posterior spinal fusion from T3 to T6. Susceptibility artifact limits evaluation of the surrounding structures. Compared to prior thoracic spine study dated 9/18/2015 there is slight increase in size of enhancing dural based mass with low T2 signal extending from T1 to the T4 levels. The increased thickening measures for example approximately 7 mm at the T2 level, previously 6 mm, and approximately 8-9 mm at the T3-4 level, previously 4 mm (measured in the sagittal plane). Craniocaudal extent is not significantly changed. There is slight increase in effacement of the dorsal thecal sac and anterior displacement of the cord. There is up to mild to moderate spinal canal stenosis at the T2 and T3-T4 levels. No evidence of frank cord compression or cord signal abnormality.There is trace grade 1 anterolisthesis of T2 on T3 which is unchanged. Exaggeration of the thoracic kyphosis is again seen. Mild multilevel degenerative changes are again seen including disc desiccation at multiple levels and small disc bulges involving the lower thoracic spine. There is no significant associated spinal canal or neural foraminal stenosis.
Compared to prior thoracic spine MRI study dated 9/18/2015, there is slight increase in dorsal dural-based thickening involving the upper thoracic spine suspected to represent mild progression of known idiopathic pachymeningitis. There is associated increase in effacement of the dorsal thecal sac without evidence of high-grade spinal canal stenosis or cord signal abnormality.