BACKGROUND Orbital tumour, benign or malignant, comprises of a fair number of patients presenting in hospitals with a mass lesion or proptosis. Its early diagnosis and treatment is necessary especially in malignant cases even it can save patient's life. MATERIALS AND METHODS We have recruited the patients presenting in our oculoplasty OPD in RIO with orbital mass lesion or any patient who has symptoms suggestive of orbital mass lesion after applying inclusion and exclusion criteria. Clinical

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... radiological diagnosis has been made and diagnostic/therapeutic surgical procedures have been performed in order to reach a histopathological diagnosis. Then, excel data sheet is prepared and statistical analysis done. RESULTS In this prospective observational study, 75 eyes (M:F=39:36) of 67 patients (M:F=32:35) with orbital tumours attending the OPD and Oculoplasty Clinic at RIO, Kolkata, were recruited. Out of the 75 eyes studied, 64 eyes (85%) were of adult age group and 11 eyes (15%) were of paediatric age group. Among all of them, 88.1% (n=59) were unilateral. The mean age of the benign group is 39.50 (±16.90) years and 40.526 (±18.46) years in the malignant group. Among the bilateral, 50% (n=4) were metastasis followed by lymphoma and pleomorphic adenoma (n=2, 25% each). In the benign orbital tumours, cavernous haemangioma (n=9, 18.8%), dermoid cyst and meningioma (n=7, 14.6% each) are common and least common are capillary haemangioma, lipoma and lymphangioma (n=1, 2% each). Malignant tumours, though less in number, still its detection and early treatment is very much helpful for the patient. Among the malignant tumour, non-Hodgkin's lymphoma (n=7, 36.8%), metastasis (n=5, 26.3%) are common. The least common is malignant solitary fibrous tumour (n=1, 5.3%). CONCLUSION To conclude, it is essential to diagnose clinically, radiologically and/or histopathologically to treat the cases. Definitive treatment may save patient's life especially in malignant cases.