Hewes D, et al. - In a consecutive series of patients with intraoperatively confirmed sigmoid sinus wall abnormalities (SSWA), researchers characterized the location and severity of transverse sinus stenosis (TSS) by conducting a retrospective review of imaging studies. TSS qualitative and quantitative analyses, including the side, type, location, extent, and severity, were conducted and contrasted with normal controls and historical controls with idiopathic intracranial hypertension (IIH). Of 36 subjects, 26 had sufficient image data. Most subjects had a certain degree of bilateral TSS, and the distal transverse sinus was involved in most stenoses. Findings suggested that SSWA subjects have an elevated incidence of TSS, with patterns varying between dehiscence and diverticulum subjects. TSS severity and total posterior fossa venous outflow are worse than normal controls but not as severe as in IIH subjects. These results have consequences for SSWA's pathophysiology and management.