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AI InsightThe physical model provides valuableinsights on a possible mechanism that affected the experimental data.
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AIM: To evaluate the cerebrospinal fluid (CSF) flow dynamics in the aqueductus sylvii of patients with obstructive hydrocephaluswho underwent endoscopic third ventriculostomy (ETV) and to predict ventriculostomy patency via aqueduct flow measurements.MATERIAL and METHODS: Twenty-four patients with obstructive hydrocephalus caused by primary aqueduct stenosis whounderwent ETV were included in the study. All the patients underwent conventional and cine magnetic resonance imaging beforeand after treatment. The flow of CSF in the aqueduct of Sylvius and prepontine cistern was assessed, and the diameter of thethird ventricle was also measured. Increase in the aqueduct flow velocity after a successful ETV was supported by the assumptionphysical model that highlights a possible mechanism that explains the clinical findings.RESULTS: The flow pattern and velocity in the prepontine cistern and aqueduct were normal in 17 out of 24 patients who respondedto ETV clinically. However, seven patients who did not respond to ETV had an abnormal flow pattern in both the prepontine cisternand aqueduct.CONCLUSION: The flow pattern in the aqueduct was normalised and velocity was increased compared with those of preoperativevalues after a successful ETV. The flow of CSF in the prepontine cistern is routinely used for ventriculostomy patency assessment.In addition, aqueduct measurements may be useful in predicting ventriculostomy patency. The physical model provides valuableinsights on a possible mechanism that affected the experimental data.