Accuracy of CT in Diagnosis of Orbital Pathology and To Determine the Site and Extent of Tumor

The present study was conducted with the following aims-To evaluate efficacy of CT in evaluating orbital diseases, To determine the site and extent of tumor and aid in decision making for treatment modality including surgery whenever necessary, To evaluate the orbit in patient clinically suspected to have orbital pathology, To detect, localize and characterize the lesion, To establish extent of lesion prior to planning the treatment. This study included 30 patients who were suspected of having orbital lesions. And all these patients underwent computed tomographic evaluation of orbit. CT is 96.6% effective in our study. And majority of patients improved after treatment after CT diagnosis. INTRODUCTION A wide spectrum of tumors and pseudotumors may involve the orbit. (1) Their clinical presentation is often nonspecific, consisting of exophthalmos, diplopia, visual loss, orbital pain or signs of orbital inflammation. Imaging plays a major role in the etiological diagnosis, providing a precise analysis of the location of the lesion, its components, and its effects on adjacent and nearby structures .(2) It studies tumor extension and often provides a good evaluation of its composition. Various modalities of imaging orbital masses are -Plain/Conventional radiography, Ultrasonography (USG), Computed Tomography (CT) and Magnetic Resonance Imaging (MRI). Although real time ultrasonography with high frequency probes provides non-ionizing, cost-effective, nonradiation, non-invasive screening technique which can be performed in outdoor patient without any use of anaesthetics or sedation, CT scan is a superior diagnostic modality. (3) The clarity of presentation of orbital structures by computed tomography has prompted investigations into detailed multiplanar anatomy of orbit. Tumor margins and inflammatory processes are so clearly defined that one can place the lesion in specific compartments and accurately determine the extent of disease processes. Extra orbital disease involving the orbit are also well