Computed Tomography (CT) contributes in the functional outcome of Endoscopic Septopasty

Background and objective: Septoplasty is the common surgical procedure performed in nasal septal deviation. Nasal obstruction is the most frequent presentation to the otolaryngologist all over the world with septal deviation. Patients usually presented with headache, epistaxis, ophthalmological, otological, upper and lower respiratory tract infections; and many more. Physical examination, Anterior Rhinoscopy (AR) and Nasal Endoscopy (NE) are considered the gold standard tools to detect septal deviation. Computed Tomography (CT) contributes in the evaluation of the nasal septum, anatomical variants and unveils the associated sinonasal diseases. This study aimed to assess the contribution of CT in endoscopic septoplasty for long term benefi ts to the patients.

Citation: Islam  otological, upper and lower respiratory tract infections for many years. CT reveals nasal septal deviation by measuring a distance from the midline above to the nasal fl oor [1].There are many other anatomical abnormalites of the structures in the nasal cavities responsible for nasal obstruction such as Hypertrophied Inferior Turbinate (HIT), Concha Bullosa (CB) and other pathologies in the paranasal sinuses may be associated with septal deviation namely Chronic Rhinosinusitis (CRS), nasal polyposis, mucocele, mucous retention cyst, tumors, and many more. Physical examination, Anterior Rhinoscopy (AR) and Nasal Endoscopy (NE) are considered the "gold standard" to evaluate septal deviation [2] and primarily used in the diagnosis of the nose and paranasal sinus diseases. These examination tools have defi nite limitations in fi nding the high and posterior deviations as well as the septal pneumatization which contribute for nasal obstruction. Septal deviation is usually associated with compensatory HIT and CB/ Paradoxical Middle Turbinate (PMT). The association of HIT or CB/PMT is not only caused by mucosal hypertrophy, but also by hypertrophy of the inferior and middle turbinate bone [3]. The contribution of preoperative CT scanning helps to detect those anatomical septal and turbinate variants; and.is of defi nite value in the evaluation of nose and paranasal sinus diseases for its subsequent and effective management [4], with a view to achieve a durable or permanent functional outcome.
There is a debate in the use of CT in the septal surgery where the costs and radiation hazards of CT is used to be considered an initial additional burden [5]. In this study it has been shown that correction of other variants and pathologies along with septal surgery at the same sitting give rise to a long term benefi t to the patients that prevent second surgery indeed.
With the introduction of CBCT in the Head-neck region and in oral-maxillofacial/dentistry, the costs and harmful effects of radiation has reduced to a great extent [6].
The use of endoscope in septal surgery has signifi cantly changed the concepts of septal surgery. The advent of nasal endoscope has revolutionized the diagnosis and treatment modalities of nose and paranasal sinus diseases and has widened the horizon of rhinology [7,8]. Lanza, et al. and H.Stammberger initially described the application of endoscopic technique for the correction of septal deformity in 1991 [9]. Nasal endoscope has the advantage to deal in complex deformities particularly high and posterior septal deviation resulting better septal correction and thus is gaining its popularity. Endoscope also aids in limited septal resection and removes ancillary sinonasal abnormalities thus more patient benefi t is achieved [10,11].
The aim of this study is to evaluate the contribution of preoperative Computed Tomography (CT) scanning in endoscopic septoplasty.

Results
In this study most patients were 31 to 40 years old (35%) and 29% were 21 to 31 years old (Table 1).

Discussion
Nasal obstruction is the most frequent complaint in otolaryngology all over the world and a septoplasty is the common performed procedure. The use of endoscope in septal surgery has signifi cantly changed the concepts of septal surgery. Patients usually reported with the complaints of headache, postnasal rhinorrhea, facial pain, snoring, Obstructive Sleep Apnea (OSA), otological and orbital symptoms, upper and lower respiratory tract manifestations many years. Physical examination with anterior rhinoscopy and nasal endoscopy was considered the gold standard for detecting septal deviation. Computed tomography (CT) can also be used to evaluate the deviated nasal septum, anatomical variants of the other nasal components and unveils the associated sinonasal diseases [12][13][14]. The basic objective of endoscopic septoplasty is to alleviate the clinical manifestations caused by septal deviation and its effects; and to treat other ancillary pathologies.
The contribution of preoperative CT prior to endoscopic septoplasty proved defi nite benefi t on functional outcome that has been highlighted in this study. Although its role in the deviated nasal septum is debatable; while some studies have shown that it is unnecessary for the diagnosis and management of deviated septum [5]. Another group of study opined that it signifi cantly infl uences the surgical management. These studies showed different results and opinions observed in the literature review subjecting computed tomography, septal deviation and septoplasty. Although it has been aptly emphasized that CT is the "gold standard" in the diagnosis of sinonasal pathologies, opinion differs in the evaluation of septal deviation [5].
CT possesses costs and radiation hazards that would be an initial additional burden in septal surgery but the added advantages were correction of other variants and pathologies at the same sitting which give rise to a long term benefi t that prevent second surgery. With the introduction of Cone-Beam Computerized Tomography (CBCT) in the Head-neck region and in oral-maxillofacial/dentistry, it becomes evident that the costs and harmful effects of radiation has been reduced to a great extent [6].
Hypertrophied inferior turbinate (39%) was found in this small series, it become evident that the bony deformity along with the mucosal hypertrophy in the contralateral side of septal deviation which corresponds most of the published literature [14,15]. Preoperative CT was useful as a deciding factor to detect the septal deviation and nasal turbinates' in three dimensional views on the surgical technique of turbinate treatment with septoplasty.
Physical examination, anterior rhinoscopy and nasal endoscopy are the hall mark to discover most of the nasal pathologies with certain limitation in the fi nding of CB/PMT in its entire length and extension of the mucous hypertrophy and bony overgrowth which was clearly evident on coronal and axial CT [16]. The mucosal and bony structures of the middle turbinate and the angle of the septum were assessed using radiological analysis before septoplasty to have good result that was documented in this study.
Over the years, the attention for OSA is growing around the globe and nasal septal deviation is one major cause. It is only responsible when it is markedly deviated what can be easily found in the conventional otolaryngological examination.
A high deviation is very diffi cult to recognize and was the responsible factor for nasal obstruction in 8 patients of our series, and evident in CT scanning. The high deviation of the septum also narrows the frontal recess resulting frontal sinusitis leading to headache [11]. Posterior deviation and septal penumatization are clearly revealed in computed tomography.
Correction of the particular areas with septal surgery alleviated symptoms completely in this series.
Physical examination, AR and NE are practically unable to visualize the posterior areas of the nasal cavities in the grossly deviated nasal septum or septal spur. CT scanning is such a modalities of investigation which provide details to the otolaryngologists / radiologists that could not be seen on regular physical examination. Thus CT has the advantages to see the ostiomeatal complex with unveiling of the paranasal sinus condition [17,18]. In this series, maxillary sinusitis The association of otitis media with nasal septal deviation has been found on CT scanning; and in our series otitis media with effusion and otitis media were ancillary fi ndings. The patients had been treated septal correction and myringotomy with a remarkable result. Chronic otitis media was also given special attention with septoplasty. It has been explained that deviation of the nasal septum interferes Eustschian tube function that changes the middle ear pressure and affects pneumatization of the mastoid [19,20]. CT has the advantages to explore the mastoid, septum and nasopharynx [21,22].  Citation: Islam

Conclusion
The contribution of CT in the evaluation of nasal septum and its associated fi nding in the present study has a great impact prior to surgery; and it gives a long term functional outcome. CT possesses certain costs and radiation hazards but with the advent of CBCT in the head neck and oral maxillofacial surgery draws special attention to minimize costs at a very reasonable level and reduce radiation hazards to an extreme low to that of computed tomography.