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(A) Axial image identifying the location of the anterior (AEF) and posterior ethmoidal foramen (PEF) shows the measurement of lamina papyracea length (LPlength); (B) coronal image shows the anterior lamina papyracea height (LPheight) from the anterior ethmoidal foramen to the ethmoidomaxillary suture (EMS) and the anterior inferomedial angle (arrow) between medial and inferior walls the orbit.
