Table 2.

Preoperative tumoral features assessed by imaging studies.

Tumoral characteristic	Number (%)
Primary tumor
Largest size
Mean ± SEM	5.8 ±0.5
[range]	[2-13]
Number
Mean ± SEM	1.5 ± 0.2(a)
[range]	[1-5]
Preoperative primary location
Pancreatic head/duodenum	27 (59%)(b)
Pancreatic body	9 (20%)
Pancreatic tail	8 (17%)
Other	2 (4%)
Metastases present	35 (76%)
Lymph node metastases present	27 (59%)
Liver metastases (limited)	14 (30%)(c)
Vessels involved/abuts	46(100%)
Portal vein or tributary	20 (43%)
SMV/SMA	16 (35%)
IVC	4 (9%)
Splenic vein	4 (9%)
Heart	2 (4%)

^(a)Six patients with gastrinomas with MEN1 had multiple primary PETs Identified preoperatively.

^(b)Imaging studies could not clearly differentiate whether in pancreatic head or duodenum.

^(c)Limited liver metastases refer to patients without diffuse liver metastases and liver metastatic disease thought completely resectable.

Abbreviations; SMV/SMA-superior mesenteric artery/vein; IVC-inferior vena cava;