Fig. 1From: Surgical outcomes of the thoracic ossification of ligamentum flavum: a retrospective analysis of 61 casesType of the thoracic OLF configuration. The thoracic OLF was classified into 3 subgroups, unilateral (a), bilateral (b), and bridged (c) types on axial CT scan, and into 2 subgroups, round (d), and beak (e) types on T2-weighted sagittal MRI. Intramedullary high-intensity areas were shown in both (d) and (e)Back to article page