LAUSR

A 76‐YEAR‐OLD MAN visited our hospital for further evaluation of the main duct intraductal papillary mucinous neoplasm (MD-IPMN) with a 15 mm mural nodule in the mid main pancreatic duct (mid-MPD) detected by contrast-enhanced computed tomography (Fig. 1a). Diffuse dilatation of the MPD (diameter >10 mm) was observed from the head to the body of the pancreas (Fig. 1b). Endoscopic ultrasonography revealed a polypoid lesion in the MPD of the pancreatic body (Fig. 1c). Endoscopic retrograde pancreatography (ERP) images showed a filling defect in the mid-MPD (Fig. 1d). Intraductal ultrasonography showed mural nodules in the defective lesion, but not in the caudal MPD. We performed mapping biopsies from the caudal MPD for negative biopsy