PMC7683612_01
Preoperative audiogram. A severe mixed sensory and conductive hearing loss is observed on the right ear, and an air-bone gap is present at low frequencies.
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F1
Pure tone audiometry showed a severe right-sided mixed hearing loss (Figure 1).
Preoperative CT scan. Air bubbles (arrow) are visible in the vestibule.
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F2
A high-resolution temporal bone CT scan on the 10th day showed pneumolabyrinth in the right vestibule (Figure 2).
Illustration depicting the anomalous stapes footplate. The arrow illustrates the bony defect, while the arrowhead illustrates a tear in the membranous stapes footplate.
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F3
The operation was done under general anesthesia; a transcanal approach with tympanomeatal flap elevation enabled the observation of a dehiscence in the center of the stapes footplate with a bony defect 0.5 mm in diameter, which was covered by a membranous tissue, and a tear was found in this membrane (Figure 3).
Postoperative audiogram. The 1-month postoperative audiogram had thresholds somewhat improved compared to the preoperative audiogram.
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F4
The vestibular symptoms and nystagmus disappeared immediately after the operation, and at her 1-month follow-up assessment, her hearing improved (Figure 4).