• Federico E Minghinelli, Pablo Raul Devoto, Agustina María Suarez Anzorena, Leandro Javier Carvallo, Matías Baldoncini, Gonzalo Bonilla, and Rodolfo Recalde.
• Division of Neurosurgery, Hospital de Clínicas "José de SanMartín", Faculty of Medicine, University of Buenos Aires, Buenos Aires, Argentina. Electronic address: minghinelli.f@gmail.com.
• World Neurosurg. 2022 May 1; 161: e162-e167.

ObjectiveTo perform measurements in normal brain imaging studies from the free edge of the falx cerebri to the genu and the body of the corpus callosum and perform a statistical analysis based on age, type of study, and sex highlighting potential surgical implication of these measurements.MethodsIn 193 normal brain imaging studies, 3 anatomical points of the corpus callosum were used to measure the distance to the falx cerebri. Horos and RadiAnt DICOM Viewer software were used to perform the measurements. Statistical analysis of data was performed with Minitab18 software.ResultsThe results obtained in computed tomography (CT) studies were: distance A, mean 2.1065 cm; distance B, mean 2.2677 cm; distance C, mean 1.765 cm. The results obtained in magnetic resonance imaging studies were: distance A, mean 1.7148 cm; distance B, mean 2.1197 cm; distance C, mean 1.5321 cm. Statistically significant differences were obtained in measurements related to the type of study and in measurements made in CT studies related to age.ConclusionsThere is a distance from the free edge of the falx cerebri to the genu and body of the corpus callosum of at least 1 cm in both CT and magnetic resonance imaging studies of normal brains. Statistically significant differences were found in the measurements in relation to the type of study and in relation to age in the measurements made in CT studies. These measurements could be important in determining the extent of bone resection in certain types of decompressive craniectomies.Copyright © 2022 Elsevier Inc. All rights reserved.

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