Chiari malformation in syndromic and non-syndromic lambdoid craniosynostosis: a longitudinal cohort study

Baseline MRI for CM1 screening appears not indicated in unisutural unilambdoid synostosis, regardless of syndromic diagnosis. Baseline MRI seems indicated for all multisuture cases with lambdoid involvement. Follow-up imaging may be limited to symptomatic patients, provided routine consultation with counseling on warning signs is done. The need for CM1-associated surgery appears more related to the underlying diagnosis than to the lambdoid fusion's impact on skull growth alone.