“One-step” approach versus “Step-up” approach minimally invasive treatment for infected pancreatic necrosis: a study protocol for a single-center, prospective, randomized controlled trial

Table 2 The IPN distribution and the selection of surgical approach

Region	IPN distribution	Surgical approach
I	Peripancreatic area†	Median abdominal approach
II
IIa	Left posterior colon area‡	Median abdominal approach or left retroperitoneal approach was used to drain the head of the pancreas
IIb	Left pelvic area§	Left retroperitoneal approach was used to drain the caudal side of the pancreas
III	Right posterior colon area¶	Right retroperitoneal approach

^† Peripancreatic area includes intraomentum, pancreas, transverse colon, and mesentery root, perisplenic, and left subdiaphragmatic area
^‡ Left posterior colon area includes left posterior colonic space, the anterior and posterior space of left pararenal, and the perirenal space, but the pelvis cavity is not involved
^§ Left pelvic area includes the anterior and posterior space of rectum
^¶ Right posterior colon area includes the posterior space of duodenum, posterior space of right colon, anterior and posterior space of right pararenal, and right perirenal space

ISSN: 1471-230X