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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
Lymphangioma
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
Cholangiocarcinoma
Acinar cell carcinoma
Poorly differentiated (small and large cell) NET
Pancreatoblastoma
Lymphoma
Metastatic malignancy