Current role of EUS in the differential diagnosis and surveillance of pancreatic cystic lesions EUS can help us in detecting some morphological changes characteristic for malignancy, like thick wall, thick septations,

macroseptations, mural nodules, presence of mass, but can also supply information on the surrounding pancreatic tissue and pancreatic duct anatomy, suggestive for CP or can define the communication of the cystic lesion with the pancreatic duct (54). Current literature #AGI-6780? keyword# data tell us that the EUS accuracy for differentiating malignant vs. non-malignant in this clinical setting ranged from 43% to 93%, with an interobserver agreement of 50% (55,56), pancreatic duct anatomy is best visible by secretin MRCP. Thus, EUS alone is not sufficient for clinical decision making, but EUS role today Inhibitors,research,lifescience,medical is no more limited to imaging alone: EUS-FNA can give some help in the characterization of pancreatic cystic lesions. EUS-FNA may provide more information:

cytology and viscosity, amylase level, CEA and molecular analysis on the aspirated fluid (56-59). It is a relatively safe procedure with a complication rate of 2.2% (mostly pancreatitis) (60,61). By means of EUS-FNA we can localize the cystic lesion, define its morphology, Inhibitors,research,lifescience,medical direct the needle to the cystic wall, mural nodules, debris, septations or associated mass. In this respect we can use various needles (25, 22, 19 gauge needle or Trucut needle), one to 3 passes and we must give the patient Inhibitors,research,lifescience,medical prophylactic antibiotics. Resuming current literature data (56-59), today we know that in the aspirated fluid the interpretation of parameters should be as reported

Inhibitors,research,lifescience,medical below: (I) CEA levels; (i) <5 ng/mL: serous cystadenoma or pseudocyst; (ii) >800 ng/mL: mucinous cystic adenoma (MCA) or cancer; (iii) CEA is the most accurate marker for differentiating mucinous from non-mucinous cysts but it cannot distinguish intraductal papillary mucinous neoplasm (IPMN) from Cilengitide MCA or benign from malignant mucinous cyst. (II) High amylase; (i) Pseudocyst and IPMN; Furthermore we know that cytology is quite read me insensitive for both diagnosis and detection of malignancy and “EUS-FNA-Surgical Correlation” accuracy ranged between 55% and 97%. About biochemical analyses on the aspirated cystic fluid new tools and possibilities are represented by immuno-molecular analysis (K-ras, p53, mucins pattern, telomerase, PCNA, VEGF, MMP-7 and so on) (62). We published that high levels of chromogranin A in the aspirated fluid can help in the diagnosis of neuroendocrine pancreatic cystic tumor (63).