Convert the text into good english and short format. A total of 35 Whipple specimens were analysed over the last 5.5 years. Out of the 36 specimens, 20 were periampullary tumor, 11 were ampullary and 4 involved both mixed site. Amongst the periampullary tumors, the most common histological diagnosis was adenocarcinoma, pancreatobiliary type. The most common diagnosis in ampullary tumors was adenocarcinoma, pancreatobilary followed by intestinal types. The most common precursor lesions encountered were- adenoma, tubulovillous and intestital type, high grade dysplasia and intra-ampullary papillary neoplasm. Apart from adenocarcinoma, 2 case each of signet ring cell carcinoma and adenosquamous carcinoma were identified.
Over the past 5.5 years, 35 Whipple specimens were analysed. Of these, 20 were periampullary tumours, 11 were ampullary tumours, and 4 involved mixed sites. Adenocarcinoma of pancreatobiliary type was the most common diagnosis in both groups, followed by intestinal-type adenocarcinoma in ampullary tumours. Common precursor lesions included adenoma, tubulovillous and intestinal-type adenoma with high-grade dysplasia, and intra-ampullary papillary neoplasm. Two cases each of signet-ring cell carcinoma and adenosquamous carcinoma were also identified.
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