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AIM This study aimed to analyze the success rates of repeat endoscopic third ventriculostomy (re-ETV) procedure according to ventriculostomy orifice closure types in patients who have undergone a second neuroendoscopic surgery for non-communicating hydrocephalus. MATERIAL AND METHODS The study included 74 patients who underwent re-ETV procedure due to dysfunctional ventriculostomy orifice. Ventriculostomy closure patterns are classified into three types: Type-1 is defined as the complete closure of the orifice with non-transparent gliosis or scar tissue. Type-2 represents the closure or narrowing of the orifice by newly formed translucent membranes. Type-3 pattern is defined as the blockage of CSF flow due to newly formed reactive membranes in the basal cisterns, with an intact ventriculostomy orifice. RESULTS The frequency of the ventriculostomy closure patterns was found as follows. Type-1: 17 cases (22.97%); Type-2: 30 cases (40.54%); and Type-3: 27 cases (36.48%). The success rate of the re-ETV procedure according to closure types was 23.52% in Type-1 cases, 46.66% in Type-2 cases, and 37.03% in Type-3 cases. A significantly higher rate of Type-1 closure pattern was observed in the myelomeningocele associated hydrocephalus cases (P 0,01). CONCLUSION In cases where ETV failure occurs, an endoscopic exploration with reopening of the ventriculostomy orifice is a preferable treatment option. Therefore, identifying patients who may benefit from the re-ETV procedure is essential. Type-1 closure pattern was observed to have a higher frequency in cases where hydrocephalus was associated with myelomeningocele, and the success rate of re-ETV seems to be lower in those cases.