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Arachnoid cysts (ACs) are frequent incidental findings and may be associated with neuropsychiatric symptoms. Usually growth of the ACs with pressure on adjacent brain tissue is regarded as cause of the symptoms. This study was undertaken to identify if and which ACs grow with time. We used a large database of cranial MRIs for a retrospective analysis. During a period of 10years, we collected 166 ACs of 50 persons, mean observational period was 2.5years. Among these, only larger cysts at the temporal pole, i.e., Galassi II ACs, grew with a rate of 0.3ml a ye