OBJECTIVE To create an easily reproducible diagnostic method based on bony anatomy
that precisely locates the distal dural ring (DDR) to determine the position of paraclinoid
aneurysms as intradural, transitional, or extradural. METHODS Bilateral anatomic
dissections of 10 cadaveric heads (20 sides) were performed to evaluate DDR anatomy. We
observed a plane that reflects the position of the DDR passes through 4 bony landmarks: 1)
The anterior clinoid-internal carotid artery intersection, 2) the optic strut, 3) the optico-carotid …

We have read the paper with great interest by Jelena Scerbak et al 1 (“Identification of the
Distal Dural Ring and Definition of Paraclinoid Aneurysms According to Bony Landmarks on
3-Dimensional Computed Tomography Angiography: A Cadaveric and Radiological Study”).
1 The authors chose 4 bony landmarks:(1) the anterior clinoid-internal carotid artery
intersection,(2) the optic strut (OS),(3) the optico-carotid elevation, and (4) the base of the
posterior clinoid process to form a plane to define the location of the distal dural ring (DDR) …