“…Until now, seven patients with a paranasal sinus aneurysm, who were treated with intravascular surgery, have been reported. [7][8][9][10][11]13,16) Among them, five were treated using coil embolization alone as the initial treatment 7,10,11,15,16) and two were treated using a combination of coil embolization and stent placement. 8,13) Of the five patients treated with coil embolization alone, only one showed a good outcome, 7) whereas the remaining four showed aneurysm recurrence and subsequently underwent additional treatment, which was a combination of coil embolization and stent placement or flow diverter placement.…”