The classification of recurrent spinal epidural hematoma: a review of the literature and a comparison with the cases.

Symptomatic postoperative spinal epidural hematoma (SEH) and spontaneous spinal epidural hematoma (SSEH) are both rare conditions, and recurrent SEH occurs even less frequently. Therefore, we describe a case of symptomatic postoperative SEH after surgical evacuation of SSEH, which was diagnosed using magnetic resonance imaging (MRI) and managed with negative pressure wound therapy (NPWT). The authors classified the reported recurrent SEHs into two types based on the cause of their previous hematoma, which can be classified as spontaneous or postoperative. The characteristics, diagnosis, managements, and results of recurrent SEHs were analyzed. The authors suggest that the postoperative SEH in the Type II will be treated with NPWT, and the new classification will be helpful for prognosis, diagnosis, and management of the recurrent SEHs.