Clinical Evaluation Of Needle-based Confocal Laser Endomicroscopy in Cystic Tumors of the Pancreas

1. Medical background: Pancreatic cysts are quite rare, but are being increasingly recognized due to the expanding use of cross-sectional imaging. They are classified into three main classes: pseudocysts, serous cysts and mucinous cystic neoplasms. Either intraductal papillary mucinous neoplasm (IPMN) or mucinous cyst adenomas / mucinous cystadenocarcinoma(MCN) Mucinous cystic neoplasms are considered to be malignant or pre-malignant and are considered for surgical resection, whereas pseudocysts and serous cysts are considered benign and with a low potential for malignancy. Pseudocysts and serous cysts are usually only considered for surgical resection when symptomatic or enlarging.
2. Clinical background:

2.1. Endoscopic Ultrasound (EUS) is the diagnostic method of choice when a pancreatic lesion is found incidentally on cross-sectional imaging. Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) is a procedure where a target tissue in proximity to the GI tract is biopsied using a fine needle guided in real time by an ultrasound probe fixed at the tip of an endoscope. It may therefore be applied to pancreatic lesions, or lymph nodes examination.

2.2. The principle of needle-based Confocal Laser Endomicroscopy (nCLE) is to image organs within or adjacent to the GI tracts with a miniprobe inserted through an endoscopic needle. The fundamental technology as well as the principle of operation of nCLE are substantially similar to pCLE. 3. Clinical evidence: Previous studies enabled to define interpretation criteria on the micro-structure of benign pancreatic cysts. Less data is available on malignant pancreatic cysts, except for a few images done in a pilot study of identification of pancreatic cystic neoplasms. 4. Objectives:

4.1 The primary objective of the study is to assess the diagnostic performance of the Cellvizio nCLE system in diagnosing pancreatic cysts, when associated with other diagnostic information.

4.2 The secondary objectives are to assess the potential impact of the Cellvizio nCLE system on patient management and validate the interpretation classification criteria that were created during the previous studies. 5. Design: