Sankaran Sneha A, Harugop Anilkumar S, Singh Yashita, Venkatramanan Mansi A R
Department of Otorhinolaryngology, Jawaharlal Nehru Medical College, Kaher, India.
Department of Otorhinolaryngology, Dr Khan's ENT Hospital, Jabalpur, Madhya Pradesh India.
Indian J Otolaryngol Head Neck Surg. 2024 Feb;76(1):245-249. doi: 10.1007/s12070-023-04135-z. Epub 2023 Aug 20.
The sinus tympani is a deep pocket of varying dimensions situated in the retrotympanum. It lies medial to the facial nerve thereby making surgical access difficult. It is this area which is frequently involved in chronic otitis media attico-antral type. Removal of disease from sinus tympani is cumbersome and expedites Cholesteatoma Recidivism. In India, very limited studies have been conducted describing the variations of Sinus tympani. Hence, this study is dedicated to estimating it's variations in volume. This is a one-year Observational Cross-sectional study conducted between January 2020 to December 2020 in Temporal Bone Dissection Lab of Department of Otorhinolaryngology and Head and Neck Surgery, J. N. Medical College, KAHER, Belgaum. 40 Human temporal bone (both left and right) have been dissected. The middle ear cavity was filled carefully with a moulding material i.e. Otoform. Once set, a 3-dimensional model of the middle ear cavity was made, which was removed carefully without causing any damage. The volume of the middle ear cavity was calculated. The other contents and parameters were measured using a measuring probe. Forty bones were dissected. The volume of the sinus tympani was measured to be 8.77 cubic mm with a range of 6.5 cubic mm to. 10.9 cubic mm hence showing that sinus tympani show a larger variability in terms of size, shape and volume. The ponticulus was Complete in 65% of the cases (26 bones) and incomplete in 35% of the cases (14 bones). The ponticulus and subiculum were found to be complete in a well pneumatized mastoid bone. The volume of the middle ear cavity was measured to be 1.17 cubic cm. The sinus tympani volume was calculated in this study employing a novel technique called the Otoform mould in cadaveric temporal bones, enabling for accurate measurement. The study concluded that sinus tympani showed a wide range in volume thus owing that it is the structure which has highest variability in terms of size and shape in the middle ear.
鼓窦隐窝是位于鼓室后隐窝的一个大小不一的深袋。它位于面神经内侧，因此手术入路困难。该区域常累及慢性中耳胆脂瘤型上鼓室-鼓窦型。从鼓窦隐窝清除病变很麻烦，且会加速胆脂瘤复发。在印度，描述鼓窦隐窝变异的研究非常有限。因此，本研究致力于评估其容积变异。这是一项为期一年的观察性横断面研究，于2020年1月至2020年12月在贝拉冈KAHER的JN医学院耳鼻喉头颈外科颞骨解剖实验室进行。解剖了40块人类颞骨（左右各半）。用一种塑形材料即耳用成型材料小心地填充中耳腔。固化后，制作中耳腔的三维模型，小心取出且不造成任何损伤。计算中耳腔的容积。使用测量探头测量其他内容物和参数。解剖了40块骨头。鼓窦隐窝的容积测量为8.77立方毫米，范围为6.5立方毫米至10.9立方毫米，因此表明鼓窦隐窝在大小、形状和容积方面存在较大变异性。65%的病例（26块骨头）桥状隆起完整，35%的病例（14块骨头）不完整。在气化良好的乳突骨中，桥状隆起和下丘完整。中耳腔的容积测量为1.17立方厘米。本研究采用一种名为耳用成型材料铸型的新技术在尸体颞骨中计算鼓窦隐窝容积，从而实现准确测量。研究得出结论，鼓窦隐窝的容积范围很广，因此它是中耳中在大小和形状方面变异性最高的结构。
