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Incidence of different types of CSF circulation disorders in 346 glioma (WHO grades 2–3) patients who underwent tumor resection between 2006 and 2019. Twenty-four patients developed permanent postoperative CSF circulation disorders, corresponding to an incidence of 6.9%. Of these, 19 had communicating hydrocephalus (CH; 5.5%), 2 had obstructive hydrocephalus (OH; 0.6%) and 3 had other types of CSF circulation disorders (2 had hygroma and 1 had ventricular entrapment; 0.8%).
