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Background: The para nasal sinuses be collection of air filled spaces adjoining the nasal cavity. Para nasal sinuses build up as of the primitive choana at 25–28 weeks of gestation. Three projections ascend from the lateral wall of the nose and work as the commencement of the growth of the para nasal sinuses. The Frequency of Anatomical Variants of Para nasal Sinuses (PNS) may be illustrated on Computed Tomography (CT) by using double slice CT machine. Aim: To reveal the anatomy of the para nasal sinuses as shown on the CT along with point out the variants lead to chronic sinusitis and escort obstacles in sino nasal operations. Methodology: This study was conducted in Ibnae-e Sieena Hospital and MMDC Multan during September 2019 to December 2019. In 50 patients without para nasal sinus diseases symptoms, head computed tomography studies were carried out after having consent from them and IRB. Para nasal sinuses coronal sections were taken. The CT studies were performed by using Dual Source multi slice CT Scanner. Results: 50 participants included in the study, 25 men with 25 women. Out of them, 22 having anatomical variants were noticed. Most common anatomical variants found were pneumatisation of center nasal turbinates (30%) then agger nasi cells 25%, Haller’s cells 20%, along with septal deviation 13% and sphenoid sinus septation (12%). Conclusion: This study shows that nasal cavity and para nasal sinuses anatomical variations are common. For the radiologic analysis of the para nasal sinuses, as of diagnosis of the pre and post -surgical evaluation and sino-nasal lesions, CT is the gold standard procedure. It can outline and explain the anatomical variants in para nasal sinuses. CT not only detect the lesion to vital constitutions which lined the para nasal sinuses but also repeated lesions that extra mural cells. CT of the para nasal sinuses has vital importance and should be passably analyze before FESS. Keywords: Para nasal sinuses, Computed tomography, Nasal turbinate, Ostiomeatal complex

Frequency of Anatomical Variants of Paranasal Sinuses (PNS) on Computed Tomography (CT)