Endoscopic imaging: How far are we from real-time histology?

Figure 5 Confocal laser endoscopy image of Barrett’s metaplasia (A) and high grade dysplasia (HGD) (B) after the intravenous administration of 5 mL of intravenous fluorescein as an exogenous contrast agent. The fluorescein enhances the subepithelial capillary network. HGD can be distinguished from non-neoplastic Barrett's esophagus by the branching, irregular capillary network and irregular, thickened basement membrane.