PMC5174163_01
Contrast axial CT shows an ovoid homogeneous enhancing lesion (38 mm x 27 mm) involving right cerebellopontine cistern (white arrow).
CRIOT2016-1947616.001.jpg
PMC5174163_01_CRIOT2016-1947616.001.jpg
fig1
Contrast CT (Figure 1) report showed that an approximately 38 x 27 mm ovoid homogeneous enhancing extra axial mass lesion involving right cerebellopontine cistern was observed.
Contrast coronal MRI shows well-defined heterogeneously enhancing T1 hypo and T2 predominantly hyperintense lesion in the right cerebellopontine angle (white arrow).
CRIOT2016-1947616.002.jpg
PMC5174163_01_CRIOT2016-1947616.002.jpg
fig2
T1 hypo and T2 predominantly hyperintense space occupying mass lesion in the right cerebellopontine angle cistern causing mild mass effect on the brain stem with extension to right internal auditory canal with subtle canal widening suggestive of acoustic neuroma (Figures 2 and 3). The extension of the tumor into the internal auditory canal represented "shark fin" appearance (Figure 4).
Contrast sagittal MRI shows well-defined heterogeneously enhancing T1 hypo and T2 hyperintense mass in the right cerebellopontine angle causing mild mass effect on the brain stem (white arrow).
CRIOT2016-1947616.003.jpg
PMC5174163_01_CRIOT2016-1947616.003.jpg
fig3
T1 hypo and T2 predominantly hyperintense space occupying mass lesion in the right cerebellopontine angle cistern causing mild mass effect on the brain stem with extension to right internal auditory canal with subtle canal widening suggestive of acoustic neuroma (Figures 2 and 3). The extension of the tumor into the internal auditory canal represented "shark fin" appearance (Figure 4).
Contrast axial MRI shows the extension of the tumor into the internal auditory canal represents "shark fin" appearance (white arrow).
CRIOT2016-1947616.004.jpg
PMC5174163_01_CRIOT2016-1947616.004.jpg
fig4
T1 hypo and T2 predominantly hyperintense space occupying mass lesion in the right cerebellopontine angle cistern causing mild mass effect on the brain stem with extension to right internal auditory canal with subtle canal widening suggestive of acoustic neuroma (Figures 2 and 3). The extension of the tumor into the internal auditory canal represented "shark fin" appearance (Figure 4).
Postoperative image shows paralysis of face on right side.
CRIOT2016-1947616.005.jpg
PMC5174163_01_CRIOT2016-1947616.005.jpg
fig5
Right retromastoid suboccipital craniotomy and total excision of lesion were performed leading to damage of cranial nerves VII and VIII resulting in hearing loss and facial paralysis with loss of taste sensation on the affected side (Figures 5 and 6).
Postoperative image shows inability to close the right eyelid and upward rolling of right eyeball.
CRIOT2016-1947616.006.jpg
PMC5174163_01_CRIOT2016-1947616.006.jpg
fig6
Right retromastoid suboccipital craniotomy and total excision of lesion were performed leading to damage of cranial nerves VII and VIII resulting in hearing loss and facial paralysis with loss of taste sensation on the affected side (Figures 5 and 6).
Histological features (H&D x40) show Antoni-A areas (black arrow), Antoni-B areas (white arrow), and Verocay bodies (blue arrow).
CRIOT2016-1947616.007.jpg
PMC5174163_01_CRIOT2016-1947616.007.jpg
fig7
Immunohistochemical analysis revealed that the lesion was positive for S-100 protein (Figures 7 and 8).
Immunohistochemistry (x40) positive for S-100.
CRIOT2016-1947616.008.jpg
PMC5174163_01_CRIOT2016-1947616.008.jpg
fig8
Immunohistochemical analysis revealed that the lesion was positive for S-100 protein (Figures 7 and 8).