This study aimed to evaluate the prevalence of Haller cells and accessory maxillary ostium (AMO) in cone-beam computed tomography (CBCT) images, and to analyze the relationships among Haller cells, AMO, and maxillary sinusitis.Volumetric CBCT scans from 201 patients were retrieved from our institution's Digital Imaging and Communications in Medicine archive folder. a Caldwell view. maxillary ostium, and Haller cell in each maxillary sinus were recorded according. Typically, the maxillary sinus is located close to the alveolar ridge of the first molar and second premolars; therefore, it is not uncommon to find the roots of the first and second molars in the maxillary antrum. The elderly group involved posterior edentulous and dentate patients. CBCT images. The right maxillary sinus seems to be opacified in the lower part (1). Both the superior and posterior walls of the frontal sinus separate the sinus from the cranial vault. CBCT images were assessed, and the presence of any pathological findings, septa, accessory maxillary ostium, and Haller cell in each maxillary sinus were recorded according to the groups. Discussion. Mucociliary transport is directed through the natural ostium in the maxillary sinus, and the accessory ostium does not play a role in its physiologic drainage. 2019 Aug 27. doi: 10.1007/s00276-019-02308-6. The elderly group involved posterior edentulous and dentate patients. 23-1 ). The maxillary sinuses were first illustrated and described by Leonardo da Vinci in 1489 and later documented by the English anatomist Nathaniel Highmore in 1651. A CT scan was performed which showed a solitary antrochoanal polyp originating in the maxillary sinus mucosa and emerging through an accessory ostium, filling up the nasal fossa, and finding its way along to the choana then to the nasopharynx, without bone destruction. 1. b Waters view. The floor of the sinus is formed by the alveolar process of the maxilla and palatine bones. Chi-square test was used to analyse the intergroup differences (p < 0.05). Frequency, location, and morphology of accessory maxillary sinus ostia: a retrospective study using cone beam computed tomography (CBCT). techniques.1,2 Accessory maxillary ostium (AMO) is an anatomic variant that may play a role in the development of maxillary sinusitis.3 Although some investigators main-tain that the accessory ostium develops after acute maxil-lary sinusitis, it is still not established whether AMO is a congenital or an acquired structure.4 Genc et al.4 investi- Surg Radiol Anat. The posterolateral wall separates it from the pterygomaxillary fissure medially and infratemporal fossa laterally (see Fig. This 26-year-old patient had pain in the right maxillary region. METHODS: Paranasal sinus computed tomography examinations of individuals aged ≥ 13 years and < 13 years were compared retrospectively. The paranasal sinuses consist of paired frontal, ethmoid, maxillary, and sphenoid sinuses. to the groups. The accessory ostium only occurs in 30 to 40 percent of the population. Fig. 7.1 a,b Conventional radiographic views for sinus evaluation. In contrary, drained mucus may enter into the maxillary sinus through the accessory ostium, and it may play a role in the pathogenesis of chronic maxillary rhinosinusitis. The maxillary sinus, or antrum of Highmore, lies within the body of the maxillary bone and is the largest and first to develop of the paranasal sinuses. [Epub ahead of print] The primary maxillary sinus ostium is located on the highest part of the medial wall of the maxillary sinus (see Fig. Jinfeng Liu, Comments about the article “frequency, location, and morphology of accessory maxillary sinus ostia: a retrospective study using cone beam computed tomography (CBCT)”, Surgical and Radiologic Anatomy, 10.1007/s00276-019-02370-0, (2019). The left frontal sinus is absent and the right frontal sinus is hypoplastic (2). OBJECTIVE: We sought to determine whether an accessory maxillary ostium (AMO) is a congenital or acquired condition and we investigated concomitant sinus pathologies associated with this structure. The frontal sinuses are located superior to the orbits and ethmoid sinuses. The floor of the frontal sinus consists of the orbital roof. were assessed, and the presence of any pathological findings, septa, accessory.