Clinical question to be answered: Status post foramina magnum shunt revision 6 -- 60. Signs and symptoms: Headaches A catheter is noted entering the subarachnoid space from the level of foramina magnum the catheter extends to the right and is against the bone at the level of foramen magnum. On the first CT image there is suggestion of thickening of the epidural space with compromise of the transverse diameter of the thecal sac. Correlate with clinical findings and if warranted an MRI is recommended. In comparison to the prior exam there is reduction in the size of fourth ventricle. The above-mentioned catheter is not within the fourth ventricle.Images through supratentorial space demonstrate extensive parenchymal volume loss of right hemisphere with no interval change. There is no residual contrast within the subarachnoid space on the right as it was noted on the prior exam. No change in position of bilateral hemispheric catheters. No ventriculomegaly is detected.
New catheter at the level of foramina magnum as detailed. Please see above comments.