Fig. 2

Computed tomography findings at presentation. a Preoperative contrast-enhanced computed tomography showed a clearly enhanced rectal lesion in Ra (red circle) with no lymphadenopathy or distant metastasis. b Contrast-enhanced computed tomography also revealed a poorly enhanced tumor 3 cm in size in the pancreatic head (red circle). c The pancreatic tumor (red arrow) widely abutted the superior mesenteric vein (blue circle)