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.