Anatomical variations in the human paranasal sinus region studied by CT

Abstract

A precise knowledge of the anatomy of the paranasal sinuses is essential for the clinician. Conventional radiology does not permit a detailed study of the nasal cavity and paranasal sinuses, and has now largely been replaced by computerised tomographic (CT) imaging. This gives an applied anatomical view of the region and the anatomical variants that are very often found. The detection of these variants to prevent potential hazards is essential for the use of current of endoscopic surgery on the sinuses. In the present work, we have studied the anatomical variants observed in the nasal fossae and paranasal sinuses in 110 Spanish subjects, using CT in the coronal plane, complemented by horizontal views. We have concentrated on the variants of the nasal septum, middle nasal concha, ethmoid unciform process and ethmoid bulla, together with others of lesser frequency. The population studied showed great anatomical variability, and a high percentage (67 %) presented one or more anatomical variants. Discounting agger nasi air cells and asymmetry of both cavities of the sphenoidal sinus, which were present in all our cases, the variations most often observed were, in order, deviation of the nasal septum, the presence of a concha bullosa, bony spurs of the nasal septum and Onodi air cells.

A study of radiological findings in chronic rhinosinusitis in southern india

“…Similar finding were observed by Perez et al (1) who reported the prevalence of deviated nasal septum to be about 80%. Dua et al (2) and Asruddin et al (3) found prevalence of 44% and 38% of deviated nasal septum in their respective studies.…”

A Study of Anatomical Variations of Osteomeatal Complex in Chronic Rhinosinusitis Patients- C T Findings

“…Severino Aires de Araujo Neto et al, reported relatively less anatomical variations 65% in the osteomeatal complex of the chronic rhino sinusitis cases [13]. Perez et al, also observed similar prevalence of anatomical variations in the chronic sinusitis cases [14].…”

“…[Table/ Fig-1]: Showing the Osteomeatal complex (OMC)-(a) The OMC-small compartment located in the region between the middle turbinate and the lateral nasal wall in the middle meatus-represents the key region for the drainage for the maxillary, anterior ethmoid and frontal sinuses in chronic rhino sinusitis cases [14,24]. The prevalence of concha bullosa in our study is on the higher side when compared to the findings of Stallmann et al, [20], Maru et al, [25] and Alkire BC et al, [26] who reported it to be 44%, 42.6% and 41.7% respectively.…”

Cone beam CT analysis of Haller cells: prevalence and clinical significance

“…5,14 This enormous variability in the frequency of The variability in the prevalence of Haller cells could also be explained on the basis of the patients' age group and race, and on the CT techniques used. 16 In the present study, we generated our own criteria of definition; the major criterion was based primarily on the distinction between Haller cells and infraorbital recess of maxillary sinus.…”