PMC7461837_01
An axial CT scan of the right mastoid bone of patient 1. The lateral semicircular canal is fused with the vestibule to a single cavity. LSCC, lateral semicircular canal; BT, basal turn of the cochlea; IAC, inner auditory canal; FN, facial nerve; ME, middle ear.
fsurg-07-00053-g0001.jpg
PMC7461837_01_fsurg-07-00053-g0001.jpg
F1
Pre- and post-operative hearing thresholds of the right ear of patient 1. [-[=, postoperative bone conduction thresholds;  - , postoperative air conduction thresholds,  - - , preoperative air conduction thresholds.
fsurg-07-00053-g0002.jpg
PMC7461837_01_fsurg-07-00053-g0002.jpg
F2
Pure tone audiometry 2 months post-surgery was unchanged with a mixed hearing loss bilaterally (Figure 2).
PMC7461837_02
Pre- and postoperative hearing thresholds of patient 2. ] -], postoperative bone conduction thresholds; x-x, postoperative air conduction thresholds; x- -x, preoperative air conduction thresholds.
fsurg-07-00053-g0003.jpg
PMC7461837_02_fsurg-07-00053-g0003.jpg
F3
Her relevant medical history included cardiac anomalies (atrial septal defect, ventricular septal defects and pulmonary artery defect), conductive hearing loss bilaterally (Figure 3), malformed ossicular chain and narrow ear canals. Audiometry tests showed a hearing improvement of frequencies 0.25, 5, 1, and 2 kHz (Figure 3).
An axial CT scan of the left mastoid bone of patient 2. There is an epitympanic fixation involving the malleus. FN, facial nerve; I, incus; M, malleus; ME, middle ear.
fsurg-07-00053-g0004.jpg
PMC7461837_02_fsurg-07-00053-g0004.jpg
F4
This showed a more horizontal orientation of the incus, epitympanic ossicular fixation (Figure 4) and dehiscent facial nerve canal on the left side.