In our case, the history, clinical findings, negative biochemistry and CT and MIBG scans indicated that the lesion might be a non-catecholamine-secreting paraganglioma. The final diagnosis of a vascular malformation was unexpected but revealed an interesting differential diagnosis of a rare pathology. Retroperitoneal vascular malformations of the choledochus, kidney and pancreas have been described but are rare conditions which may cause digestive or urinary tract bleeding.8 In this case the symptoms were unrelated to the excised lesion. Final diagnosisBenign vascular malformation.

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The nasal cavity and paranasal sinuses are exposed to many environmental pollutants and pathogens. Exposure to such influences can lead to a variety of lesions primarily affecting the sinonasal tract. The aim of this study was to find out the incidence, age and sex distribution and to enlist the different types of lesions of the nasal cavity and paranasal sinuses. Materials and Methods: A study of 122 cases was conducted over a 2 year period. Both retrospective and prospective cases were included in the study. All relevant clinical details, tissue sections with H&E, special stains and IHC stains were done whenever necessary. Result: Out of 122 cases, 98 non-neoplastic cases and 24 neoplastic cases were diagnosed. Maximum n on-neoplastic cases were detected in the third and fourth decade. Benign lesions were commonly noted in fourth and seventh decade. Malignant lesions of sinonasal tract commonly afflicted patients of 61 to 70 years of age. Non-neoplastic and benign lesions showed male predominance. Female preponderance was noted in malignant lesions of sinonasal tract. Among non-ne oplastic lesions, sinonasal polyp (84 cases) was most prevalent. Maximum proportion of benign lesions were diagnosed as hemangioma (6 cases) and sinonasal papilloma (5 cases). Among malignant neoplastic lesions, 4 cases were of squamous cell carcinoma and 3 cases were of malignant melanoma. Conclusion:A variety of lesions with overlapping clinical features can affect the sinonasal tract. Histopathology remains the gold standard for establishing the diagnosis in such cases.