• Miguel A Barboza, Carolina Mejías, Jonathan Colin-Luna, Alejandro Quiroz-Compean, and Antonio Arauz.
• Stroke Clinic, Instituto Nacional de Neurologia y Neurocirugia Manuel Velasco Suárez, México City, México.
• J. Neurol. Neurosurg. Psychiatr. 2015 Dec 1;86(12):1314-8.

Background And PurposeFew studies have examined collateral formation in patients with cerebral venous thrombosis (CVT). The aim of this study was to analyse the impact of baseline intracranial venous collaterals on the clinical outcome and imaging features of patients with acute CVT.Material And MethodsMRIs from consecutive patients with acute CVT were retrospectively analysed. The category system described by Qureshi was used to assess the pattern of venous collaterals. Clinical and imaging features and outcomes were analysed using bivariate and multivariate models to assess the association of collateral patterns with the type of parenchymal lesions and clinical outcome (modified Rankin Scale) at 30 and 90 days.ResultsOne hundred patients were included (77 women; median age 32 years; and median of 18 months of follow-up). Venous collaterals were present in 88% of the patients; type I collaterals in 3 patients, type II collaterals in 27 patients, and type III collaterals in 58 patients. Twelve patients did not exhibit any collaterals. Cohen's κ coefficient between evaluators was 0.86. In the bivariate analysis, type III collaterals were associated with isolated intracranial hypertension and complete recovery, whereas type I collaterals were associated with encephalopathy. However, in the multivariate regression analysis, the collateral pattern was not associated with clinical presentation, type of brain lesion or outcome.ConclusionsIntracranial venous collaterals are frequently found in patients with CVT during the acute phase. However, they do not have an independent effect on the type of brain damage, clinical manifestations or prognosis.Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

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