case_images: PMC10644746_01
case_images: Axial image of high-resolution T2 weighted three-dimensional sequence, gradient recalled echo (CISS) showing a normal appearance of the left facial colliculus (arrow) and the absence of the protrusion of the right facial colliculus (head arrow).
case_images: 10.1177_2333794X231208365-fig1.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig1.jpg
case_images: fig1-2333794X231208365
case_images: However, the 3D CISS sequence revealed the absence of the protuberance of the right facial colliculus (Figure 1) and the right-sided facial nerve along its entire path, with the cisternal portion of the internal auditory canal containing the vestibulocochlear nerve solely (Figures 2, 3a and 4a).
case_images: Axial image of high-resolution T2 weighted three-dimensional sequence, gradient recalled echo (CISS) image showing a normal aspect of the cisternal segment of the left facial nerve (white arrow), anterior to the cochleovestibular nerve (white star). Non visualization of the cisternal segment of the right facial nerve.
case_images: 10.1177_2333794X231208365-fig2.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig2.jpg
case_images: fig2-2333794X231208365
case_images: However, the 3D CISS sequence revealed the absence of the protuberance of the right facial colliculus (Figure 1) and the right-sided facial nerve along its entire path, with the cisternal portion of the internal auditory canal containing the vestibulocochlear nerve solely (Figures 2, 3a and 4a). The facial nerve was visible on the left side (Figures 2, 3b, 4b, 5a and b).
case_images: Axial image of high-resolution T2 weighted, gradient recalled echo (CISS) images. (a) Right side: Absence of the labyrinthine segment of the right facial nerve and the geniculate fossa (Asterix). (b) Left side: normal aspect of the labyrinthine segment of the left facial nerve and the geniculate fossa (white arrow).
case_images: 10.1177_2333794X231208365-fig3.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig3.jpg
case_images: fig3-2333794X231208365
case_images: However, the 3D CISS sequence revealed the absence of the protuberance of the right facial colliculus (Figure 1) and the right-sided facial nerve along its entire path, with the cisternal portion of the internal auditory canal containing the vestibulocochlear nerve solely (Figures 2, 3a and 4a). The facial nerve was visible on the left side (Figures 2, 3b, 4b, 5a and b).
case_images: Sagittal oblique T2 weighted high-resolution three-dimensional sequence, gradient recalled echo (CISS) images. (a) Right side: Emptiness of the antero-superior quadrant and absence of the facial nerve. Visualization of the superior and inferior vestibular nerves (double arrow) and the cochlear nerve (white arrow). (b) Left side: normal aspect of the sagittal oblique reconstruction image of internal auditory canal appearing as 4 dots. Intracanalicular segment of the facial nerve (head arrow), inferior vestibular nerves (double arrow) and the cochlear nerve (white arrow).
case_images: 10.1177_2333794X231208365-fig4.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig4.jpg
case_images: fig4-2333794X231208365
case_images: However, the 3D CISS sequence revealed the absence of the protuberance of the right facial colliculus (Figure 1) and the right-sided facial nerve along its entire path, with the cisternal portion of the internal auditory canal containing the vestibulocochlear nerve solely (Figures 2, 3a and 4a). The facial nerve was visible on the left side (Figures 2, 3b, 4b, 5a and b).
case_images: Axial image of T1 weighted imaging non contrast using the pointwise encoding time reduction with radial acquisition, known as PETRA (3D) showing the normal path and signal of the left facial nerve (head arrow): geniculate fossa (a), and the mastoid segment (b).
case_images: 10.1177_2333794X231208365-fig5.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig5.jpg
case_images: fig5-2333794X231208365
case_images: The facial nerve was visible on the left side (Figures 2, 3b, 4b, 5a and b).
case_images: Axial high-resolution CT scan showing the normal path of the left facial nerve (head arrow). Geniculate fossa (a), tympanic segment in the fallopian canal (b) and mastoid segment (c). Absence of the right sided geniculate fossa, fallopian canal and mastoid segment
case_images: 10.1177_2333794X231208365-fig6.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig6.jpg
case_images: fig6-2333794X231208365
case_images: Coronal high-resolution CT scan showing the normal path of the left facial nerve (head arrow). Tympanic segment in the fallopian canal (a) and the stylomastoid foramen (b). Absence of the right sided fallopian canal and stylomastoid foramen.
case_images: 10.1177_2333794X231208365-fig7.jpg
case_images: PMC10644746_01_10.1177_2333794X231208365-fig7.jpg
case_images: fig7-2333794X231208365