Figure 2

Pre- and postoperative images of Case 2. Pre-operative computed tomography image showed peak of ossification of the posterior longitudinal ligament at T1/2 vertebral level (A). C3-T5 posterior decompression with instrumented fusion surgery was performed. The patient showed incomplete paralysis on sitting, but rapidly recovered after bed rest. An emergent computed tomographic-myelogram revealed no apparent abnormalities (B). X-ray images obtained when the patient was lying (C) and sitting (D) showed no apparent motion between fused segments.