 Hello everyone, my name is Dr. Amogan Vekar and I'm currently doing MD radio diagnosis in Justice K.S. Hector Charitable Hospital and Medical College. The topic for my presentation is anatomical variations of paranesal sinuses in the CT scan and its association with the chronic sinusitis. Coming to the introduction, chronic sinusitis is a common pathology encountered in our day-to-day study. Anatomical variations in paranesal sinuses are more commonly found in such patients and it needs assessment. CT scan is an excellent modality for the evaluation of the anatomical variations and as well as the paranesal sinuses and its pathology. It helps in assessment of the drainage of the sinuses, extent of the sinusitis, variations and thus helps the surgeon infest surgery that is a functional endoscopic sinus surgery. The study is conducted to correlate the anatomical variations and its association with the pathophysiology of sinusitis. The aim of this particular study is to evaluate the anatomical variations in the patients with chronic sinusitis, to evaluate the prevalence of the sinunasal variants and assess its association with the chronic sinusitis, to lightly evaluate the variations that contribute strongly to the disease process of the sinusitis, that is the pathophysiology of the sinusitis. Methods. In this retrospective study, 100 patients with clinical symptoms of sinusitis who underwent CT scan in the past six months were included. Multiaxial unenhanced images of paranesal sinuses were obtained using 128 slice G-spiral CT machine and later coronal and sagittal repomance were done. The anatomy of the paranesal sinuses were evaluated in both soft tissue window as well as bone window and the findings were tabulated. Inclusion criteria for this particular study was patients with clinical symptoms of paranitis, nasal obstruction and headache and the exclusion criteria was patients with history of paranesal sinuses, paranesal sinus surgery, patients with the sinunasal malignancy and patients with the history of road traffic accidents and with the patient factors. Findings. The parameters that were particularly in observed in the interest world, nasal turbinates, nasal septum deviation, sinuses in the world and the extent of its involvement, then at point 8 cells like agar-naceous cells, onodic cells and halar cells and spinous sinuses variations. So, for example, pneumatization of the clenoid process, serigoid process and greater wink of the spinoid. So, the findings that were tabulated were here you can see an access section of CT scan in the bone window, access section of CT head in the bone window showing the conca bullosa in the left middle turbinate, conca bullosa can be out for two types. One is involving the turbinate, another one is involved with the stroke of the turbinate, however, the involvement of the turbinate is the more common finding. And in the second image, you can see that there is hyperneumatization of the right spinoid sinus. Also, there is associated left maceric sinusitis with the air fluid level, which is strongly suggestive of acute sinusitis. Here we have a coronal image of a patient with a coronal image of head in the bone window showing deviated nasus septum to the right. Here, the deviation is rather mild, whereas in the second image, you can see that there is cross deviation of the nasus septum to the left along with the bony spine. There is also bilateral maceric sinusitis with the near total, near total opacification of the right maceric sinus. Here we have in the image one, a case of sinusoidal polyposis with bilateral maceric sinusitis. In image two, what we get to see is a D-lander type one optic nerve. D-lander classified optic nerves into four variants. This, those are type one, where an optic nerve is adjacent to the spinoid sinus, type two, where the optic nerve is connecting the spinoid sinus, type three, traversing through the spinoid sinus, and type four, the optic nerve lies adjacent to the spinoid sinus and the posterior part of the air cells. This becomes particularly important in the spec surgery and is a useful information for the surgeon. Then here we have heroes type two olfactory posa that is noted. Heroes again pass for olfactory posa into three types, type one, type two, type three, type one, depth of olfactory posa is 1 to 3 mm, type two, 4 to 7, and the type three, 8 to 16 mm. The results of this particular study were among the 100 patients evaluated, 30% of the patients showed concavulosa. The incidence was more or more commonly seen in the middle dopamine. Divacid nasal septum was seen in 44% of the patients. Some patients even had a bonus birth abutting the nasal turbinates and the nasal wall associated. The incidence of sinusitis were more common in the maxillary sinus and frontal sinus. Pan sinusitis was noted in three patients and spinner sinus hyperneumatization was noted in six patients. Conclusion, which was finally drawn with this particular study was the study showed that the Divacid nasal septum is a common finding in the patients with chronic sinusitis and can be considered a significant part of the factor in the disruption of normal mucociliary clearance. Concavulosa is a common anatomical variant noted. However, mostly the patients are asymptomatic. The etymol sinus cells like ponody cells, agarinesis cells and hella cells may be incidentally found in patients with sinusitis, however, has no strong correlation. The knowledge of anatomical variations and its elaboration is indeed a useful tool for it can provide the surgeon with sufficient information for performing a safe endoscopic sinus surgery. Following weather references, I used for this particular study. Thank you.