case_images: PMC10513086_01
case_images: Imaging of case one. (A-C) Cystic lesion in the tympanic cavity on axial computed tomographic (CT) imaging; (B) enlarged fallopian canal at labyrinthine segment; (D) normal fallopian canal and tympanic cavity on the contralateral left side; (E) hypointensity of the lesion on T1-weighted imaging (T1WI), with mixed signals of exudate in the mastoid cavity; (F) hyperintensity of the perigeniculate lesion on T2-weighted imaging (T2WI); (G) hypointensity of the lesion on coronal T2 fluid-attenuated inversion recovery imaging (T2 FLAIR); (H) part of the lesion was enhanced on T1-weighted contrast-enhanced imaging; (I) exploration revealed a cyst-like lesion was located in the tympanic cavity, along the length of the facial nerve; (J) massive cerebrospinal fluid (CSF) leaked was observed upon piercing the cyst; (K) CSF was released from the defective fundus of the internal auditory meatus.
case_images: fneur-14-1226404-g001.jpg
case_images: PMC10513086_01_fneur-14-1226404-g001.jpg
case_images: fig1
case_images: Partial lesions were even contrast-enhanced (Figure 1). The facial nerve trunk was separated into multiple filaments and laid freely in the CSF (Figure 1).
case_images: PMC10513086_02
case_images: Imaging of case two. (A) Axial computed tomographic (CT) image displaying enlarged fallopian canal at the labyrinthine segment, a cystic lesion at geniculate ganglion, and defective adjacent middle cranial fossa floor; (B) mixed hypointensity and hyperintensity at the tympanic segment of the facial nerve on T1-weighted imaging (T1WI); (C) hyperintensity of the perigeniculate lesion on T2-weighted imaging (T2WI); (D) mixed hypointensity and isointensity at the tympanic segment on T2 fluid-attenuated inversion recovery imaging (T2 FLAIR).
case_images: fneur-14-1226404-g002.jpg
case_images: PMC10513086_02_fneur-14-1226404-g002.jpg
case_images: fig2
case_images: MRI revealed mixed hypointensity and hyperintensity on T1WI, hyperintensity on T2WI, mixed hypointensity and isointensity on T2 FLAIR imaging, and hypointensity on DWI (Figure 2).