Diseases of the paranasal sinuses include a wide spectrum of conditions ranging from inflammation to neoplasms, both benign and malignant. These sinuses are in close anatomical relationship with orbit, cranial fossa and pterygopalatine fossa. Hence early involvement of these areas is an important feature. CT imaging provides detailed information of the paranasal sinuses and is now well established as an alternative to standard radiographs. It is hospital based, prospective correlational descriptive clinic radiological study, 104 symptomatic paranasal sinus diseased patients were evaluated by clinical and CT (both axial and coronal sections) findings for the management of patients. All the patients underwent endoscopy or FESS following CT evaluation and findings were correlated.CT diagnosis had higher sensitivity, specificity, positive predictive value and negative predictive value in diagnosing anatomic variants of PNS, chronic sinusitis, sinonasal polyps, and other lesions in comparison to clinical diagnosis. However, sensitivity of CT was not so high in diagnosing fungal sinusitis as seen with other lesions. But involvement of the bone by PNS lesions was always demonstrated by the CT, which is the standard imaging modality to demonstrate it accurately.
