A 52-year-old man underwent pancreatoduodenectomy(PD)for invasive cancer of the pancreatic head, with a histopathological diagnosis of moderately to poorly differentiated invasive ductal carcinoma. One year and 2 months after PD, follow- up CT revealed a mass 3 cm in diameter in the remnant pancreas without distant metastasis. Therefore, total remnant pancreatectomy was performed with a histopathological diagnosis of adenosquamous carcinoma. Five years after re-excision, the patient remains alive without recurrence. Although no tumor component was found at the anastomotic site of the pancreatojejunostomy, squamous metaplasia with chronic inflammation with carcinogenic potential was diffusely observed in the main pancreatic duct. Clinical cases of remnant pancreatic resection after PD for invasive cancer are relatively rare. Furthermore, this case of adenosquamous carcinoma with long-term recurrence-free survival is extremely rare.
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