Table 5.

Histopathological outcomes of all specimens.

	All specimens	Resection specimen	FNA
PanNET	131 (89.1%)*	106 (96.4%)*	25 (67.6%)
Normal pancreas	6 (4.1%)	2 (1.8%)	4 (10.8%)
PDAC	7 (4.8%)*|^	2 (1.8%)*	5 (13.5%)|^
Other or not representative	3 (2.0%)	0 (0%)	3 (8.1%)

All tissues were collected indicating that patients could contribute multiple specimens; with regards to FNA, three patients had two biopsies of the same lesion. In one patient, the FNA was positive for a PanNET twice; in one, normal pancreatic tissue was followed by PanNET; and in the last patient, the biopsy was positive for PDAC twice. One patient had FNA of two lesions, so the 37 FNA results represent 34 lesions from 22 patients.

^*In one patient, the tumor was a collision tumor consisting of a PDAC surrounded by multiple PanNETs.

^|In one patient, a biopsy was initially positive for PDAC; revision of the specimen during follow-up changed the conclusion into a PanNET.

^{^}In one patient with a PDAC-positive biopsy, the surgical resection specimen revealed a PanNET and no PDAC.

FNA, fine needle aspiration; PDAC, pancreatic ductal adenocarcinoma; PanNET, pancreatic neuroendocrine tumor.