• José J C Nascimento, Leandro M Silva, Elayne C O Ribeiro, Eulâmpio J S Neto, Severino A Araújo-Neto, and Paula R B Diniz.
• Postgraduate Program in Neuropsychiatry, Federal University of Pernambuco, Recife, Brazil. Electronic address: josejailson64@gmail.com.
• World Neurosurg. 2021 Aug 1; 152: 121-123.

ObjectiveTo describe the foramen magnum angle (FMA) as a new parameter for basilar invagination (BI) type B.MethodsThe FMA was performed on sagittal slice of magnetic resonance imaging (MRI) as a line from the hard palate to the opisthion (angle vertex), and another line from the opisthion to the basion. The MRIs from 31 participants with BI type B and 96 controls were used. Intraclass correlation coefficient, descriptive data, and receiver operating characteristic (ROC) curve were used for statistical analysis at the 95% confidence interval.ResultsThe interobserver agreement of the FMA was 0.952. Patients with BI type B had a FMA significantly greater (25.9° ± 9.3°) than control participants (11.6° ± 4.9°) (P < 0.001). The area under the ROC curve showed a diagnostic value of 0.947. The FMA showed sensitivity 0.900 and specificity 0.854 for the cutoff criterion 17° (P < 0.001).ConclusionsThe FMA had an optimal diagnostic value that provided complementary evidence to investigate BI type B.Copyright © 2021 Elsevier Inc. All rights reserved.

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