• Joe Iwanaga, Evan Courville, Mahindra Kumar Anand, Pervez A Khan, Oded Goren, Markus Lammle, C J Bui, Aaron S Dumont, and R Shane Tubbs.
• Department of Neurosurgery and Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, Louisiana, USA; Division of Gross and Clinical Anatomy, Department of Anatomy, Kurume University School of Medicine, Kurume, Japan. Electronic address: iwanagajoeca@gmail.com.
• World Neurosurg. 2020 Jul 1; 139: e38-e44.

ObjectiveSome have suggested that trabeculae within the transverse sinuses (chordae Willisii) might restrict flow and potentially contribute to thrombus organization. In addition, these structures might be encountered with endovascular procedures within the transverse sinus and are now readily seen on imaging. Therefore as anatomic studies of these structures are scant, the current study aimed to better elucidate these structures within the transverse sinus via a morphologic study in cadavers.MethodsThirty fresh-frozen, cadaveric transverse sinuses were dissected, and their detailed morphology was recorded. Classification schemes were applied based on the anatomy and orientation of each chordae.ResultsChordae were found on 70% of sides and were statistically more likely to be found on right sides (86.6%) (P < 0.01). Three types and 3 classes of chordae were identified. There was a statistically significant difference between sides regarding type of chordae (P = 0.02).ConclusionsTo date, a comprehensive anatomic evaluation of the intraluminal chordae of the transverse sinuses has been lacking. Knowledge of these bands is also essential to those performing endovascular procedures of the dural venous sinuses and for those interpreting imaging of these structures.Copyright © 2020 Elsevier Inc. All rights reserved.

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