Table 2.

Surgical and pathological characteristics

Variable	IPNB (n = 16)	ICPN (n = 7)
Anatomic location
Left intrahepatic bile ducts	4	N/A
Right intrahepatic bile ducts	1	N/A
Liver hilum	3	N/A
Common bile duct	8	N/A
Pre-operative histology/cytology (n = 10)
Negative	2	N/A
Cytologic atypia	1	N/A
Suspicious for malignancy	1	N/A
High grade dysplasia	4	N/A
Adenocarcinoma	2	N/A
Surgery performed
Left hepatectomy	4
Segmental resection	2
Pancreaticoduodenectomy	5
Choledochectomy	5
Lap cholecystectomy		3
Open cholecystectomy		1
Open cholecystectomy + liver wedge		3
R0 resection	12	7
R1 resection	4	0
Epithelial subtype
Pancreatobiliary	10	5
Intestinal	6	1
Gastric	0	1
Mean tumour size (cm ± SD)	3.1 ± 2.0	6.2 ± 7.3
Non-invasive	0	3
Microinvasion (<5 mm)	4	2
Invasion (>5 mm)	12	2
T stage
Tis	0	3
1	7	1
2a	7	1
3	2	2
N stage
X	4	3
0	8	4
1	2	0
2	2	0
Lymphovascular Invasion present	6 (n = 15)b	3 (n = 6)
Perineural Invasion Present	6 (n = 13)	0 (n = 5)

^aCombines T2, T2a, T2b (each anatomic location has unique T staging).

^bnot all pathology reports commented on lymphovascular or perineural invasion.

cm, centimetre; mm, millimetre; n, number of patients; SD, standard deviation.