Reason: evaluate for subdural cyst History: s/p fenestration of thoracic subdural cyst Alignment is anatomic. Marrow signal is normal for age. There is been interval fenestration of the arachnoid cysts with laminoplasty from T2 to T9. There are postsurgical changes including edema within the posterior epidural space and paraspinous tissues, particularly along the spinous processes from T2 to T5. Increased T1 signal at these levels posterior to the thecal sac likely reflects some postsurgical blood products. However, there is no significant mass effect on the posterior thecal sac. A small amount of T1 hyperintensity along the left aspect of the spinous process T3 also likely represents postsurgical blood. The arachnoid cysts seen on the prior myelogram at the T3-T4 level and T7-T8 level are not specifically visualized, however mass effect on the cord has resolved. For example, the dorsal thecal sac at T2-T3 measures 3 mm, previously 5 mm. At T8, the dorsal thecal sac measures 2 mm, previously 5 mm. The lower thoracic cord and conus is slightly deviated rightward with mild clumping of the nerve roots abutting the right lateral dural margin; findings likely related to adhesions/mild arachnoiditis. Scattered increased signal is seen in the lungs, likely atelectasis.
1.Expected postsurgical findings related to fenestration of two thoracic arachnoid cysts with resolution of previously seen mass effect and deformity of the thoracic cord.2.Mild rightward deviation of the distal thoracic cord with mildly clumped nerve roots abutting the right lateral dural margin, findings likely related to adhesions/mild arachnoiditis. 