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Preoperative computed tomography. (A) through (E) Preoperative computed tomographic scans show congenital spinal stenosis from L1 to L5, respectively. Axial images show ossification of the ligamentum flavum (OLF) at L1/2 (A), L2/3 (B) and L3/4 (C) (arrowheads). (F) Sagittal scan shows OLF at L1/2 (A) to L3/4 (C) and spinal stenosis with thickened lamina and narrowing of the lateral recess at L4/5 and L5/S (arrowheads).
