Abstract
In 1997, Lambert and colleagues demonstrated that the absence of sinus fluid on head CT essentially excludes a fracture involving the sinus walls. Our purpose is to reevaluate this association utilizing the current standard of imaging technology. With improved image resolution, we aim to reassess whether the sensitivity and specificity of the “clear sinus sign” are improved or worsened. Furthermore, the current standard of care is to obtain a CT of the facial bones along with a head CT when facial trauma is suspected, so we also analyzed the association of the "clear sinus sign" with nasal bone and mandible fractures. We identified 629 facial bone CT scans performed on adult patients in the emergency department between July 2012 and May 2013. They were retrospectively analyzed by three reviewers for the presence of facial bone fracture and/or fluid opacification of at least one paranasal sinus (as defined by either complete sinus opacification or an air-fluid level - circumferential mucosal thickening was considered the absence of fluid). We found that sinus opacification was 98.8% specific for facial bone fracture but only 44.7% sensitive. However, for complex facial fractures, such as zygomaticomaxillary complex, orbital, and sinus fractures, the lack of sinus fluid is significantly more sensitive at 91%. Therefore, our results for complex facial fractures are congruent with those of the previous studies conducted by Lambert, et al. and Lewandowski, et al. However, we also demonstrate that sinus opacification is not specific for nasal bone or mandibular fractures.
Highlights
Maxillofacial trauma is potentially life-threatening due its association with spinal and intracranial injuries
We identified 629 facial bone CT scans performed on adult patients in the emergency department between July 2012 and May 2013
Bar graph showing the percentage of positive fractures in all cases, sinus opacification in all cases, and nasal/anterior maxillary spine fractures out of all fractures with total fractures in each category indicated in parentheses. 36% of all studies contained facial bone fractures. 45% of facial bone fractures had sinus opacification. 53% of all fractures were nasal and anterior maxillary spine fractures
Summary
Maxillofacial trauma is potentially life-threatening due its association with spinal and intracranial injuries. With improving CT technology, multi-detector CT has become the standard of care for evaluation of patients with acute facial trauma. Full body CT is usually performed along with head CT as approximately half of maxillofacial injuries are associated with multisystem trauma [1,2,3,4]. There are approximately twelve million head CT scans performed each year and this number has been steadily rising [5]. How to cite this article Grechushkin V, Boroda K, Chaudhry A, et al (February 09, 2016) Reevaluating the Utility of Maxillary Sinus Opacification as a Screening Tool for Facial Bone Fracture a Decade After Its Original Analysis.
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