case_images: PMC7683612_01
case_images: 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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case_images: F1
case_images: Pure tone audiometry showed a severe right-sided mixed hearing loss (Figure 1).
case_images: Preoperative CT scan. Air bubbles (arrow) are visible in the vestibule.
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case_images: F2
case_images: A high-resolution temporal bone CT scan on the 10th day showed pneumolabyrinth in the right vestibule (Figure 2).
case_images: 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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case_images: F3
case_images: 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).
case_images: Postoperative audiogram. The 1-month postoperative audiogram had thresholds somewhat improved compared to the preoperative audiogram.
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case_images: F4
case_images: The vestibular symptoms and nystagmus disappeared immediately after the operation, and at her 1-month follow-up assessment, her hearing improved (Figure 4).