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Table 2 Classification of Papanicolaou Society for assessment of cytological sampling of the pancreatobiliary system. (NET - neuroendocrine tumor; IPMN - intraductal papillary mucinous neoplasm; MCN - mucinous cystic neoplasm)

From: Prospective comparison of slow-pull and standard suction techniques of endoscopic ultrasound-guided fine needle aspiration in the diagnosis of solid pancreatic cancer

Papanicolaou society of cytopathology system for reporting pancreaticobiliary cytology
I. Non-diagnostic  
II. Negative (for malignancy) Benign pancreatic tissue
Acute, chronic or autoimmune pancreatitis
Pseudocyst, lymphoepithelial cyst
Splenule/accessory spleen
III. Atypical  
IV. Neoplastic - Benign Serous cystadenoma
Neuroendocrine microadenoma
IV. Neoplastic - Other Well-differentiated NET
IPMN, all grades of dysplasia
MCN, all grades of dysplasia
Solid-pseudopapillary neoplasm
V. Suspicious (for malignancy)  
VI. Positive or Malignant Ductal adenocarcinoma of the pancreas and its variants
Acinar cell carcinoma
Poorly differentiated (small and large cell) NET
Metastatic malignancy