الفهرس 
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Abstract
Introduction: Hydrocephalus following myelomeningocele repair is commonly associated with variable intracranial anomalies, which can make the management of hydrocephalus by ETV and/or CPC technically challenging. Aim of the work: The purpose of this study was to determine the sensitivity of FIESTA-C/CISS MRI in detecting anatomical variants that could have surgical implications during ETV and CPC and assess the success of ETV/CPC during the follow up of the study. Methods: A prospective study was conducted over a two-year period on 23 patients with hydrocephalus following myelomeningocele repair. All patients underwent FIESTA-C/CISS MRI before and after ETV and/or CPC. Anomalies in the intraventricular pathway of ETV or CPC were assessed and compared to previous MRI findings to evaluate its sensitivity. Patients were followed up radiologically and clinically at one, three and six months. Results:There were 11 males (47.8%) and 12 females (52.2%). The sensitivity of FIESTA-C/CISS MRI for detecting anatomical variants was as follows: body of the fornix (52.2%), septum pellucidum (82.6%), foramen of Monro (91.3%), third ventricle size (90.9%), massa intermedia (86.8%), thickness of the floor of the third ventricle (86.4%), inclination (90.9%), prepontine interval size (100%), and presence of arachnoid membranes (81.8%). No mortality in our patients and 17 out 23 (74%) patients were followed up with succeeded ETV/CPC while six patients needed VPS placement. Conclusions: Intraventricular and CSF-related anatomical variants can be detected by FIESTA-C/CISS MRI studies when applied before endoscopy. Due to the high sensitivity of FIESTA-C/CISS MRI, the application of this data provides prospects for surgical planning and increases the success rate of ETV. Key words: Myelomeningocele, hydrocephalus, ETV, CPC.