malignant neoplasm of pancreaspancreatic endocrine neoplasmpancreatic cystic neoplasmmucinous neoplasm pancreasmalignant neoplasm of head of pancreasserous cystic neoplasm pancreasmucinous cystic neoplasm pancreascystadenocarcinoma pancreascystadenoma pancreasmost common pancreatic tumorpseudopapillary neoplasmtumour in pancreas