Massive Hemorrhage from the Posterior Ethmoidal Artery during Transsphenoidal Surgery: Report of 2 Cases.

Nasal bleeding is a major complication that can occur during and after transsphenoidal surgery (TSS) for intra- and suprasellar tumors. In most cases, the cause of this bleeding can be attributed to a branch of the maxillary artery called the sphenopalatine artery, injury to which can lead to life-threatening situations. Upon exposure of the suprasellar region and planum sphenoidale during surgery, it is also important to avoid damaging the posterior ethmoidal artery (PEA), a branch of the ophthalmic artery. While recent advancement in endoscopic techniques enables the performance of extended TSS, the chances of PEA injury seem to be increasing. In the current report, we present two cases that showed massive PEA bleeding during regular (not extended) TSS. The total blood loss was 2280 ml and 2150 ml, and endoscopic views disturbed by the massive hemorrhages remarkably delayed accurate stanching of the responsive artery. Therefore, anatomical recognition of the PEA is required to avoid fatal hemorrhaging during even regular TSS, especially for the beginners of this surgery.