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INTRODUCTION: The ampullary and periampullary region represents a complex anatomical interface comprising the ampulla of Vater, distal common bile duct, pancreatic head and second part of the duodenum, giving rise to a heterogeneous spectrum of neoplastic lesions. Periampullary tumors include carcinomas arising from these distinct anatomical sites, with adenocarcinoma being the predominant histological malignancy. Ampullary carcinomas may be further categorized according to their anatomical origin and histomorphology into pancreatobiliary and intestinal histological subtypes. Consequently, carcinomas in this region arise through different precursor pathways, rather than from a single adenoma–carcinoma sequence. Recent WHO-based classifications and the 2025 PERIPAN consensus emphasize determining the epicenter and compartment of the precursor lesion to establish the origin of the subsequent carcinoma. Accurate identification of the site of origin and histological subtype is challenging because of the close anatomical relationships and overlapping morphology, yet is critical for prognostication and therapeutic decision-making. The pancreatobiliary and intestinal subtypes also demonstrate distinct immunophenotypic and biological characteristics, emphasizing the importance of an integrated histopathological approach. MATERIALS & METHODS: A retrospective descriptive analysis of patients with ampullary and periampullary tumors was performed in the Department of Pathology from January 2021 to July 2026 using histopathological specimens evaluated following pancreatoduodenectomy (Whipple procedure). Patients with tumors involving the ampulla of Vater, pancreatic head, distal common bile duct and second part of the duodenum were included. The histopathological findings were reviewed and the results were studied, analysed and clinically correlated. RESULTS: 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. CONCLUSION: The ampullary and periampullary region encompasses a diverse spectrum of histological lesions, with adenocarcinoma representing the predominant malignancy and pancreatobiliary and intestinal differentiation constituting the principal histological subtypes. The prognosis of these tumors after curative surgery differs according to the precursor lesions. Thus, histological subtyping along with identification of these precursor lesions has important prognostic and therapeutic implications, as presence of these precursor lesions show significantly worse prognosis with a greater tendency toward advanced disease, and are an independent prognostic factor for recurrence in multivariate analysis. Thus, accurate anatomical localization and comprehensive pathological evaluation remains central to appropriate diagnosis, prognostication and individualized management of these tumors. convert the text into 250 words

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Introduction: The ampullary and periampullary region is a complex anatomical interface comprising the ampulla of Vater, distal common bile duct, pancreatic head, and second part of the duodenum. Tumors arising in this region are heterogeneous, most commonly adenocarcinomas. Ampullary carcinomas are classified by anatomical origin and histomorphology into pancreatobiliary and intestinal subtypes. These tumors may arise through different precursor pathways rather than a single adenoma-carcinoma sequence. Recent WHO-based classifications and the 2025 PERIPAN consensus emphasize identifying the tumor epicenter and compartment of the precursor lesion to determine the site of origin. Accurate localization and histological subtyping are challenging because of close anatomical relationships and morphological overlap, but are important for prognosis and treatment planning.
Materials and Methods: A retrospective descriptive study was performed in the Department of Pathology from January 2021 to July 2026. Histopathological findings from pancreatoduodenectomy specimens were reviewed. Tumors involving the ampulla of Vater, pancreatic head, distal common bile duct, and second part of the duodenum were included and clinically correlated.
Results: Thirty-five Whipple specimens were analyzed over 5.5 years. Twenty tumors were periampullary, 11 were ampullary, and four involved mixed sites. Adenocarcinoma, pancreatobiliary type, was the commonest periampullary diagnosis. Among ampullary tumors, pancreatobiliary-type adenocarcinoma predominated, followed by intestinal-type adenocarcinoma. The common precursor lesions were intestinal-type tubulovillous adenoma with high-grade dysplasia and intra-ampullary papillary neoplasm. Two cases each of signet-ring cell carcinoma and adenosquamous carcinoma were identified.
Conclusion: Adenocarcinoma is the predominant malignancy in ampullary and periampullary tumors. Histological subtyping and recognition of precursor lesions are important for prognosis, recurrence risk assessment, and individualized management.
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