Hyperbaric Oxygen Therapy Can Improve Neurological State Post Meningioma Removal Surgery

Inclusion Criteria: * Post intracranial meningioma removal surgery 3-12 months prior to the inclusion in the study. * All patients have to have persistent cognitive or neurological complaints regarding without noticeable improvement during the last month prior to their enrolment. * Age 18 years or older. Exclusion Criteria: * Dynamic neurologic/cognitive improvement or worsening during the past month; * Evidence of dynamic cognitive/neurological improvement in the last month. * Previous brain radiotherapy and/or radiosurgery. * Steroids dependence * Seizures 1 month previous to inclusion * Had been treated with HBOT for any other reason 1 month prior to inclusion; * Have any other indication for HBOT; * Chest pathology incompatible with pressure changes; * Inner ear disease; * Patients suffering from claustrophobia; * Inability to sign written informed consent; * Smoking patients will not be allowed to smoke during the study and if they would not comply with this demand they will be excluded.