Figure legends
Figure 1.
A. Preoperative nasal endoscopic finding indicating excretion of pus from the infected sphenoid sinus including osteonecrosis. Arrowheads indicate the sphenoid sinus.
B. Preoperative axial computed tomography (CT) showing osteonecrosis of the sphenoid sinus, with damage to the right internal carotid canal. Arrows indicate the right internal carotid canal.
C. Postoperative nasal endoscopic findings 15 months after surgery indicating the reconstructed sphenoid sinus with removal of necrotic tissue. Arrowheads indicate the reconstructed sphenoid sinus.
D. Postoperative axial CT 15 months after surgery showing the reconstructed sphenoid sinus and skull base.
Figure 2.
A. Endoscopic finding during spontaneous hemostasis indicating that the sphenoid sinus is filled with clot and flows into the nasal cavity. Arrowheads indicate the sphenoid sinus.
B. The conventional angiography showing no hemorrhage site or pseudoaneurysm in the internal carotid artery.
Figure 3.
A. Postoperative CT angiography showing that revascularization is achieved by high-flow bypass and peripheral arteries are sufficiently visualized. Arrowheads indicate radial artery graft as a high-flow bypass.
B. Postoperative single-photon emission computed tomography image showing no decrease in cerebral blood flow.