The most common type of pancreatic cancer is adenocarcinoma arising from the ductal lining. Another type of pancreatic cancer is the neuroendocrine tumour of the pancreas, which can vary from a quiescent presentation (grade 1 neuroendocrine tumours) to sinistral manifestations (neuroendocrine carcinoma) with signs of spread. Yet another type of pancreatic cancer is cystadenocarcinoma, where longstanding cystic tumours of the pancreas undergo cancerous transformation.