Abstract：
Background: Removal of the surrounding bone during dacryocystorhinostomy may present a higher risk of skull base injury in patients with frontal sinus aplasia. We used sinus plain films to predict cases with a greater risk of a reduced skull base distance in dacryocystorhinostomy. Methods: Sinus plain films and computed tomography data from patients were retrospectively evaluated. The frontal sinus was classified as normal, hypoplastic, or aplastic according to Waters’ view. Correlations of the frontal sinus roof-supraorbital margin (F-O) and the frontal sinus roof-nasion (F-N) distances on plain film with the closest lacrimal sac-anterior skull base (LS-ASB) distance measured on computed tomography images were assessed. Results: We evaluated 110 patients. In total, 16 (11.8%) patients had frontal sinus aplasia, of whom 6 (2.7%) had bilateral and 10 (9.1%) had unilateral aplasia. Sides with frontal sinus aplasia based on Waters’ view had a shorter median LS-ASB distance than normal or hypoplastic sides. The F-O and F-N distances in Waters’ view were significantly positively correlated with the computed tomographic LS-ASB distance. The F-O margin and F-N distance thresholds for predicting an LS-ASB distance < 10 mm, considered a risky distance, were 11.6 and 14.4 mm, respectively, with sensitivities of 100% and 91.7%, and specificities of 76% and 82.7%, respectively. Conclusions: The LS-ASB distance is closer on aplastic frontal sinus sides. Waters’ view on plain sinus films can provide a fast and inexpensive method for evaluating the skull base distance and sinonasal condition during planning for dacryocystorhinostomy.
摘要：
背景：泪囊鼻腔造口术中去除周围骨可能会增加额窦发育不全患者颅底损伤的风险。我们使用窦平片来预测泪囊鼻腔造口术中颅底距离减小的风险更大的病例。方法：回顾性评估患者的鼻窦平片和计算机断层扫描数据。额窦被归类为正常,发育不良,根据Waters的观点或塑料。评估了平片上额窦顶-眶上缘（F-O）和额窦顶顶（F-N）距离与计算机断层扫描图像上测得的最近泪囊-前颅底（LS-ASB）距离的相关性。结果：我们评估了110例患者。总的来说,16例（11.8%）患者额窦发育不全，其中6例(2.7%)患有双侧发育不全,10例(9.1%)患有单侧发育不全.根据Waters的观点，额窦发育不全的侧的LS-ASB距离中位数比正常或发育不良侧短。Waters视图中的F-O和F-N距离与计算机断层扫描LS-ASB距离显着正相关。用于预测LS-ASB距离<10mm的F-O余量和F-N距离阈值，被认为是危险的距离，分别为11.6和14.4毫米，分别,敏感度为100%和91.7%，特异性分别为76%和82.7%，分别。结论：再生障碍额窦侧LS-ASB距离较近。Waters在普通窦膜上的视图可以提供一种快速且廉价的方法，用于在计划泪囊鼻腔造口术期间评估颅底距离和鼻窦状况。
