Case-control Study Of Subdural Hygroma From Dynamic CT Cisternography

Objective: The aim of this in vivo study was to study cerebral spinal fluid (CSF) dynamic law, presume major causes and pathogenesis of subdural hygroma, and to suggest a classification for the disease in order to guide clinical therapies.Method/Study Design: Set patient group and control group. Dynamic CT scan with Omnipaque through vertebral canal cisternography by lumbar puncture was our tool, which gave us CT values of every ventricle, cerebral cisternae in subarachnoid and subdural cavity at 0, 1, 6, 12, 24 and 48 hour. We drew the flexuous curves with CT values to reflect the CSF dynamics and make independent-samples T test to look for difference of developing or expurgating speed between patient and control group.Results: Peak time of Omnipaque in cerebral cistern of patients delayed about 6 hours compared with that in control group. The developing level of Omnipaque was lower and the clearance was significantly slower after independent-samples T test in all the patients. It did not expurgate at 24 hour until 48h in cistern of patients while it had expurgated at 24h in control. Significantly, the "asymmetric developing" was frequently found in many cisterns in patients, which manifested that only partial or unilateral cisternae have been developed. Part of the IV ventricles showed the countercurrent of Omnipaque both in patient and control group, while part of the other...