ROLE OF ULTRASONOGRAPHY AND MAGNETIC RESONANCE IMAGING IN EVALUATION OF ORBITAL AND RETRO-ORBITAL LESIONS

Abstract

Background and aims In this study,we aimed to correlate the USG and MRI ndings of various orbital and retro-orbital lesions, prevalence of orbital and retro-orbital lesions in various age and sex groups, evaluation of orbital and retroorbital space to assist in the diagnosis of proptosis and assessing orbital lesion's location, conguration, extent, and relationship to adjacent structures In this cross-sectional study, 56 patients referred from various departme Materials and methods nts of Silchar Medical College and Hospital to the department of Radiology for various orbit and retro-orbital lesions have undergone orbital B-scan examination using SAMSUNG PRESTIGE RS-80A via high frequency probes. On the revelation of the lesion in B- scan, these patients were subjected to MRI examination of the orbit. MRI evaluation was carried out on SIEMENS TIM AVANTO 1.5T Scanner.Patients with ocular trauma and periorbital injuries, metallic implants ,ocular foreign bodies and hypersensitivity to contrast agents were excluded. Out of 56 patients, 25cases(44.6%) Results: were benign and 19 cases (33.9%) were inammatory and 12 cases were malignant(21.5%). The most common age group was in the range 0-10 years (62.5% cases) with male preponderance (55.3%). Out of 19 inammatory lesions, the most common was combined preseptal and postseptal cellulitis (31.5%). The most common benign lesion was Dermoid (84%).Retinoblastoma was the most common malignant tumor (83.33%). The most common clinical presentation was proptosis (48.2%). USG B scan should be Conclusion: used as the initial examination as the primary modality since it is readily available at a reasonable price. USG is advised if there are any MRI contraindications. MRI is considered the imaging modality of choice for assessing the spread of the disease, describing the exact location, and making an accurate diagnosis. We found that the sensitivity and specicity of MRI is higher than USG for the detection of orbital and retro-orbital lesions.Keywords: MRI, USG, Orbital B-scan, Lesions.