Preoperative defining system for pancreatic head cancer considering surgical resection

Table 1 Important abbreviations used in the new preoperative defining system for pancreatic cancer

Symbol	Description	Comments
Resectability
R	Resectable
BR	Borderline resectable
LA	Locally advanced
Location
H	Pancreatic head	Hu: uncinate process,
		Hn: neck portion
Vascular structure
CA	Celiac axis
CHA	Common hepatic artery
GDA	Gastroduodenal artery	OGA: origin of gastroduodenal artery
aRHA	Aberrant right hepatic artery
Rt/Lt	Right/left
SMA	Superior mesenteric artery
SMV	Superior mesenteric vein
SMV-SV-PV	Superior mesenteric vein-splenic vein-portal vein

R: Resectable pancreatic cancer; BR: Resectable pancreatic cancer; LA: Locally advanced pancreatic cancer.