 Endocytoscope system ECS The endocytoscope is a newly developed system that can be passed through the working channel of a standard bronchoscope, and provides high magnification views x450 of cell surfaces. About 5mls of 0.5 methylene blue solution is used to stain the area of interest, and images are obtained by contact with the cell surface. Use of the ECS has already been shown to allow discrimination between normal and abnormal tissue in situ in the setting of bronchial dysplasia and malignancy. 