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The prevalence of preoperatively increased ICP in sagittal suture synostosis probably ranges from 2.5 to 14%, and increases with age. The prevalence of preoperatively increased ICP in metopic suture synostosis probably ranges from 2 to 8%, and for isolated coronal suture synostosis around 16%. Thompson et al, 1995–1; Renier et al, 2000; Mathijssen et al, 2006; Eley et al, 2012; Wall et al, 2014; Van Veelen et al, 2013; Van Veelen et al, 2015; Cornelissen et al, 2017.