Radiology Which of the following is not true regarding ossified posterior longitudinal ligament (OPLL)? A Most commonly involves thoracic spine B Gradient echo MR sequence may overestimate the canal stenosis C MRI is best for diagnosis D Low signal intensity on all MR sequences 💡 Explanation Which of the following is not true regarding ossified posterior longitudinal ligament (OPLL)? ✓ Correct Answer: A. Most commonly involves thoracic spine