Anatomical variation of the posterior septal artery leads to refractory epistaxis

Abstract Purpose To report a rare variant of the posterior septal artery (PSA), which supplies blood to the posterior mucosa of the contralateral nasal septum. Case report A 31‐year‐old female patient underwent suture removal 14 days after septoplasty and developed left‐sided epistaxis 6 h after suture removal. To safely and effectively relieve the patient from epistaxis, the cauterization of the left PSA was performed under general anesthesia. However, 24 h after the first surgical hemostasis, the patient experienced epistaxis again in the right nasal cavity. We have reviewed the patient's sinus computed tomography again and found a rare variant of PSA, which is the right‐sided PSA passing through a bony canal in the left‐sided nasal septum. Discussion The variant of PSA well explained the failure of the first hemostatic surgery. Therefore, we again performed a cauterization of the right‐sided PSA, after which the patient recovered and no further epistaxis occurred. Conclusion When cauterization of PSA is used to manage posterior epistaxis, it is necessary to pay attention to the possible variation in PSA.