Absent stapedius muscle and its tendon concomitant with otosclerosis: a case report on embryology, imaging, and treatment.

IF 1.2 4区 医学 Q3 ANATOMY & MORPHOLOGY
Marta Mękarska, Tomasz Wojciechowski, Kazimierz Niemczyk, Robert Bartoszewicz
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Abstract

This study aimed to discuss the clinical implications associated with the absence of the stapedius muscle and concomitant otosclerosis. The causes of mixed hearing loss are presented based on its embryonic development, audiological tests, and high-resolution computed tomography (CT) imaging. This case describes a 35-year-old female patient diagnosed due to bilateral conductive hearing loss. The patient complained of a significant deterioration of hearing and speech understanding lasting for several months. Preoperative audiometric work-up revealed air-bone gap with the presence of Carhart's notch characteristic for otosclerosis. In CT scans otospongiotic focus was confirmed and the absence of stapedius muscle, its tendon, and pyramidal eminence was discovered. The patient underwent stapedotomy with good hearing result after healing. Understanding the stapedius muscle's development process is essential to comprehend the reason for its failure - the absence of the stapedius muscle results in exposure to acoustic trauma. Patients may experience hypersensitivity to sound, although it was not discovered in the described patient. High-resolution CT is a handy tool for analyzing congenital malformations of the middle ear. The absence of the stapedius muscle may also be indicated by other anatomical variations of the middle ear detected with high-resolution computed tomography images. The absence of the stapedius muscle may coexist with otosclerosis. Detailed in-depth analysis of high-resolution computed tomography images is the only tool to assess for stapes muscle defects without surgical intervention.

镫骨肌及其肌腱缺失伴耳硬化:一例胚胎学、影像学和治疗报告。
本研究旨在探讨镫骨肌缺失和伴随耳硬化症的临床意义。混合性听力损失的原因提出了基于其胚胎发育,听力学测试和高分辨率计算机断层扫描(CT)成像。本病例描述了一位35岁的女性患者,诊断为双侧传导性听力损失。病人自诉听力和言语理解明显恶化,持续了几个月。术前听力学检查显示气骨间隙和Carhart切口的存在是耳硬化的特征。CT扫描证实了耳海绵状病灶,发现镫骨肌、其肌腱和锥体隆起的缺失。患者行镫骨切除术,愈合后听力良好。了解镫骨肌的发育过程对于理解其失败的原因至关重要-镫骨肌的缺失导致听损伤。患者可能会对声音过敏,尽管在所描述的患者中没有发现。高分辨率CT是分析先天性中耳畸形的便捷工具。镫骨肌的缺失也可以通过高分辨率计算机断层图像检测到的其他中耳解剖变化来指示。镫骨肌缺失可能与耳硬化症共存。对高分辨率计算机断层图像进行详细深入的分析是评估镫骨肌缺陷而无需手术干预的唯一工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Anatomical Science International
Anatomical Science International 医学-解剖学与形态学
CiteScore
2.80
自引率
8.30%
发文量
50
审稿时长
>12 weeks
期刊介绍: The official English journal of the Japanese Association of Anatomists, Anatomical Science International (formerly titled Kaibogaku Zasshi) publishes original research articles dealing with morphological sciences. Coverage in the journal includes molecular, cellular, histological and gross anatomical studies on humans and on normal and experimental animals, as well as functional morphological, biochemical, physiological and behavioral studies if they include morphological analysis.
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