Table 1.

Characteristics of IPMN based on cellular morphology (data from surgical series) [28–30]

	Gastric type	Intestinal type	Pancreatobiliary type	Oncocytic type
Morphology	Thick finger-like papillae	Villous papillae	Complex thin branching papillae	Complex thick papillae with eosinophilic oncocytic cells
MUC gene expression
- MUC 1	−	−	+	−/+
- MUC 2	−	+	−	−/+
- MUC 5AC	+	+	+	+
- MUC 6	+	−/+	−/+	−
Percentage of IPMNs	46–63%	18–36%	7–18%	1–8%
Location
- Head	69–72%	64–67%	63–67%	25–33%
- Body or tail	28–31%	33–37%	34–37%	67–75%
Main-duct involvement	19%	63%	50%	38%
Invasive progression	10%	40%	68%	50%
Type of adenocarcinoma	Tubular (79%)	Colloid > tubular	Tubular (82%)	Tubular > colloid
Mural nodules	30%	56%	57%	100%
Recurrence rate	9%	20%	46%	14%
5-year survival	85%	85%	54%	79%

IPMN, intraductal papillary mucinous neoplasm