case_images: PMC5569943_01
case_images: Axial CT scan. Showing soft tissue mass in the right external auditory canal with widening and occlusion of right ear canal (blue arrow) and small middle ear soft tissue opacity (green arrow).
case_images: CRIOT2017-4736895.001.jpg
case_images: PMC5569943_01_CRIOT2017-4736895.001.jpg
case_images: fig1
case_images: There was also soft tissue seen in the sinus tympani (Figures 1-3).
case_images: Coronal CT scans. (a) Soft tissue mass in the right external auditory canal (green arrow) extending into Prussak's space (blue arrow). (b) Minimal erosion of the scutum (blue arrow).
case_images: CRIOT2017-4736895.002.jpg
case_images: PMC5569943_01_CRIOT2017-4736895.002.jpg
case_images: fig2
case_images: There was also soft tissue seen in the sinus tympani (Figures 1-3).
case_images: Limited coronal CT scan of right ear revealing a lesion in the area of the second genu of the facial nerve (blue arrow).
case_images: CRIOT2017-4736895.003.jpg
case_images: PMC5569943_01_CRIOT2017-4736895.003.jpg
case_images: fig3
case_images: There was also soft tissue seen in the sinus tympani (Figures 1-3).
case_images: PMC5569943_02
case_images: Intraoperative images. (a) Showing lesion filling ear canal and extending out onto the squamous temporal bone (black arrow). (b) Showing disease on the facial nerve (blue arrow). (c) Postremoval of posterior canal wall, showing ossicles and disease on the facial nerve (black arrow).
case_images: CRIOT2017-4736895.004.jpg
case_images: PMC5569943_02_CRIOT2017-4736895.004.jpg
case_images: fig4
case_images: The perineural lesion was removed from the facial recess and sinus tympani completely (Figure 4).
case_images: Hematoxylin and eosin stain (H&E stain). (a) Ear canal ganglioneuroma (10x). Showing (arrow) surface squamous epithelium of the external auditory canal and the ganglioneuroma beneath the surface. (b) High power (40x) showing ganglion cells (blue arrow) without rim of satellite cells among Schwannian stroma (black arrow). (c) (10x) Epitympanum showing ganglion cells (arrow).
case_images: CRIOT2017-4736895.005.jpg
case_images: PMC5569943_02_CRIOT2017-4736895.005.jpg
case_images: fig5
case_images: There are no neuroblasts seen in the current specimen, which was submitted entirely (Figure 5).
case_images: PMC5569943_03
case_images: (a) Neurofilaments protein immunostain, showing bundles of axons (arrow). (b) Synaptophysin immunostain, showing cytoplasm of ganglion cells (blue arrow) and also axons (black arrow). (c) Neuronal nuclear immunostain, showing the ganglion cells cytoplasm and nuclei (arrow).
case_images: CRIOT2017-4736895.006.jpg
case_images: PMC5569943_03_CRIOT2017-4736895.006.jpg
case_images: fig6
case_images: Immunohistochemistry staining used neurofilaments protein immunostain (showing bundles of axons), synaptophysin immunostain (showing cytoplasm of ganglion cells and also axons), and neuronal nuclear immunostain (showing the ganglion cells' cytoplasm and nuclei) (Figure 6).