Dear Editor:

I read an interesting recently published article, “Intradural Extramedullary Hematoma After Cervical Epidural Injection: A Case Report” by Oh et al. [1]. Because intradural extramedullary hematoma is a complication that rarely occurs after a cervical interlaminar epidural steroid injection, it is a very meaningful report in the field of pain medicine. However, there is one issue in this article.

Oh et al. performed a cervical interlaminar epidural steroid injection, and for the procedure, the needle tip was approached through the posterior interlaminar and finally located in the posterior epidural space. Therefore, theoretically, the hematoma caused by cervical interlaminar epidural steroid injection can develop in the posterior epidural space. Previous studies reported hematoma in the posterior epidural space after cervical interlaminar epidural steroid injection [2-4]. However, the study by Oh et al. reported the occurrence of intradural extramedullary hematoma, especially at the anterior to the spinal cord. Therefore, I believe that it is not definite that the intradural extramedullary hematoma occurred due to the procedure of Oh et al.; Oh et al. should clarify the mechanism of why this unusual adverse event occurred.

None.

No potential conflict of interest relevant to this article was reported.