PMC5869564_01
Imaging findings of the tumor. a CT revealed a well-defined polycystic tumor mass at the pancreatic head. b Accumulation of fluorodeoxyglucose was demonstrated in the pancreatic head on FDG-PET. The maximum standardized uptake value was 3.5 (white arrow). A diffuse hypermetabolic appearance matching the pancreas was caused by endoscopic retrograde cholangiopancreatography-induced pancreatitis (red arrow). c MRI revealed a well-defined cystic mass exhibiting high intensity on T2-weighted images at the pancreatic head. d EUS revealed a well-defined hypoechoic polycystic tumor with an internal septum at the pancreatic head.
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F1
No metastasis to the lymph nodes or other organs was found in the CT scan (Fig. 1a). 18-Fluorodeoxyglucose positron emission tomography (FDG-PET)/CT showed a hypermetabolic appearance matching the peripheral wall of the tumor mass. The maximum standardized uptake value was 3.5 (Fig. 1b). T2-weighted images. There was no continuation between the main pancreatic duct and tumor and no dilatation of the main pancreatic duct (Fig. 1c). Endoscopic ultrasound (EUS) revealed a well-defined polycystic tumor mass with an internal septum (Fig. 1d).
Representative photomicrographs of tissue sections. a The resected specimen obtained from subtotal stomach-preserving pancreaticoduodenectomy revealed a cystic mass (80 x 75 x 30 mm) at the pancreatic head. b The tumor was composed of spindle-shaped cells in a fasciculated and disarrayed architecture (hematoxylin-eosin, x200). c S-100 was detected in the tumor cells (x200). d C-kit was not detected in the tumor cells (x200).
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F2
Immunohistochemical studies showed S100 protein expression and the absence of CD34 and c-kit protein expression (Fig. 2).