RESUMEN
PURPOSE: It is imperative for prognostic improvement of pancreatic cancer that we try to diagnose carcinoma in situ (CIS) of lesions, i.e., precursors of invasive ductal carcinomas (IDCs) at an early stage, because results of treatment of patients with IDCs themselves continue to be rather unsatisfactory. MATERIALS AND RESULTS: We report here a case of a patient who received subtotal pancreatectomy for widespread and multifocal CISs of the pancreas after preoperative brushing cytology from the epithelium of dilated main pancreatic duct proved cancer-positive preoperatively. CONCLUSIONS: From our experience, we conclude that examination for CIS of the pancreas must be recommended whenever dilatation of relatively large pancreatic ducts is found by ultrasound or computed tomography. We should therefore advance to magnetic resonance cholangiopancreatography or endoscopic retrograde cholangiopancreatography and then cytological and/or pathological assessment of the pancreatic duct whenever non-continuous narrowing, localized dilatation, or other irregularities are encountered.