RT Journal Article SR Electronic T1 A new index for the assessment of transverse sinus stenosis for diagnosing idiopathic intracranial hypertension JF Journal of NeuroInterventional Surgery JO J NeuroIntervent Surg FD BMJ Publishing Group Ltd. SP 173 OP 177 DO 10.1136/neurintsurg-2016-012605 VO 9 IS 2 A1 Carvalho, Gustavo Balthazar da Silveira A1 Matas, Sandro Luiz de Andrade A1 Idagawa, Marcos Hideki A1 Tibana, Luiz Antônio Tobaru A1 de Carvalho, Renato Sartori A1 Silva, Matheus Luis Souza A1 Cogo-Moreira, Hugo A1 Jackowski, Andrea Parolin A1 Abdala, Nitamar YR 2017 UL http://jnis.bmj.com/content/9/2/173.abstract AB Background and purpose To assess the role of MR venography (MRV) for detecting transverse sinus stenosis, to determine the importance of this finding in idiopathic intracranial hypertension (IIH), and to propose an index that contributes to this diagnosis.Materials and methods We retrospectively assessed consecutive intracranial MRV of patients aged >18 years diagnosed with IIH according to the diagnostic criteria, between January 2010 and July 2012. The assessments were randomly analyzed by three radiologists. Stenoses in the right and left transverse sinuses were independently classified according to the following scale: 0, normal; 1, stenosis <33%; 2, stenosis 33–66%; 3, stenosis >66%; and 4, hypoplasia or agenesis. We established an index based on multiplication of the stenosis scale values for each transverse sinus. A point and range estimate of the sensitivity, specificity, and the area under the receiver operating characteristic curve was performed to obtain cut-off points to differentiate between controls and patients.Results 63 individuals were included in this study: 32 (50.8%) diagnosed with IIH (31 (96.9%) women and 1 (3.1%) man) and 31 (49.2%) controls. According to all of the examiners, the IIH group showed a higher degree of stenosis than the control group. Index values ≥4 for a diagnosis of IIH had a sensitivity and specificity of 94.7% and 93.5%, respectively.Conclusions MRV should be used to assess patients with suspected IIH, and bilateral transverse sinus stenosis should be considered for the diagnosis. The stenosis classifying index proposed here is a fast and accessible method for diagnosing IIH.