case_images: PMC8216801_01
case_images: (a, b) Preoperative axial CT showing (asterixs) the petrous apex with bone erosion and a titanium plate covering the partially covering anterior limitation of the temporal bone. (c, d) Non-EPI DWI with coronal and axial planes. Note the diffusion restriction in the petrous apex of the left temporal bone.
case_images: CRIOT2021-5541703.001.jpg
case_images: PMC8216801_01_CRIOT2021-5541703.001.jpg
case_images: fig1
case_images: A titanium net had been implanted to stabilize the middle and posterior cranial fossae in a revision surgery six years earlier (Figure 1).
case_images: Intraoperative image showing the petrous apex with the cholesteatoma matrix prior to removal. The superior semicircular canal has been plugged, sealed, and partly amputated.
case_images: CRIOT2021-5541703.002.jpg
case_images: PMC8216801_01_CRIOT2021-5541703.002.jpg
case_images: fig2
case_images: Hopkin's wide-angle endoscope was used to control the extension and removal of the cholesteatoma of the petrous apex that could not be assessed with the microscope (Figures 2 and 3).
case_images: 3D reconstruction of CTs. (a) The preoperative scan reconstruction. (b) The postoperative scan exhibiting the defect of the petrous apex after the partial translabyrinthine approach.
case_images: CRIOT2021-5541703.003.jpg
case_images: PMC8216801_01_CRIOT2021-5541703.003.jpg
case_images: fig3
case_images: Hopkin's wide-angle endoscope was used to control the extension and removal of the cholesteatoma of the petrous apex that could not be assessed with the microscope (Figures 2 and 3).
case_images: Coronal CT of the amputated superior semicircular canal (asterix) and the postoperative defect of the left petrous apex.
case_images: CRIOT2021-5541703.004.jpg
case_images: PMC8216801_01_CRIOT2021-5541703.004.jpg
case_images: fig4
case_images: All cholesteatoma matrixes were eliminated from the petrous apex (Figure 4).
case_images: Left ear, pre- ( air conduction and  bone conduction) and postoperative ( air conduction and  bone conduction) pure-tone audiogram. Hearing thresholds remained on the operated left ear one year after surgery.
case_images: CRIOT2021-5541703.005.jpg
case_images: PMC8216801_01_CRIOT2021-5541703.005.jpg
case_images: fig5
case_images: The preoperative hearing threshold could be preserved by superior semicircular canal plugging (Figure 5).