Background: Probe-based confocal laser scanning endomicroscopy enables in vivo real time histopathology of the mucosa layer. Recently, a prototype of a new confocal miniprobe has been developed that is small enough to be introduced through a 22-gauge puncture needle.
Objective: The aim of this study was to evaluate the feasibility of such needle-based confocal laser scanning endomicroscopy (nCLE) for in vivo histology of various organs in a porcine model.
Design: Feasibility study.
Setting: Nonsurvival animal experiments with the animals under general anesthesia at three academic centers.
Interventions: Ten pigs were examined while they were under general anesthesia. Either EUS-guided organ puncture or natural-orifice transluminal endoscopic surgery (NOTES) procedure was used. The confocal miniprobe was inserted through the 22-gauge needle, and puncture of various intra-abdominal structures and organs was performed (lymph nodes, diaphragm, ovaries, liver, spleen, and pancreas) after intravenous injection of fluorescein (5-10 mL 1% or 2 mL 10% solution). Real-time sequences were recorded. Biopsy specimens were taken for standard histopathology.
Main outcome measurements and results: It was technically feasible to introduce the needle-based confocal miniprobe into various organs at the time of EUS or NOTES procedures. The device enabled real-time in vivo collection of images at histologic resolutions and of acceptable image quality from several intra-abdominal organs interrogated.
Limitations: Data were assessed in an experimental animal setting and on healthy organs only.
Conclusions: Needle-based confocal laser endomicroscopy (CLE) of intra-abdominal organs is feasible in a porcine model. This innovative, minimally invasive technique has the potential to facilitate in vivo histology during EUS punctures or NOTES peritoneoscopy.
Copyright 2010 American Society for Gastrointestinal Endoscopy. Published by Mosby, Inc. All rights reserved.