PMC4898001_01
57-year-old man with extramedullary intradural spinal arachnoid cyst. Axial T2-weighted MR image shows a deformed cord at the T5-T6 level where the AP cord diameter is 3mm. Comparatively, the AP cord diameter above and below this level is 6mm.
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AVM. At this point the patient underwent a second MR study without contrast enhancement and which again showed marked anterior displacement or atrophy of the cord (Fig. 1), as well as serpiginous flow voids in the thoracic subarachnoid space and cord edema (Fig. 2).
57-year-old man with extramedullary intradural spinal arachnoid cyst. A, Axial CT myelogram post intrathecal Omnipaque-240 contrast injection shows an intermediately dense epidural ovoid filling defect (arrowhead) in the thecal sac, causing anterior displacement of a deformed thoracic spinal cord (arrow). B, Sagittal reformatted CT myelogram shows the same filling defect in the sagittal plane at the T6 level.
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To further evaluate the etiology of the thoracic spinal cord compression and the signal voids seen in the subarachnoid space, a thoracic CT myelogram with multi-planar reformatting was performed after the intrathecal injection of 10mL Omnipaque-240 contrast (Fig. 3).