Confocal laser endomicroscopy in the “in vivo” histological diagnosis of the gastrointestinal tract

Table 1 Confocal criteria for squamous cell epithelium and carcinoma

	Squamous cell epithelium	Squamous cell neoplasia
Cellular criteria	Dark, homogeneous epithelial cells; regular architecture and clearly visible borders	Dark cells with different sizes; no clearly visible borders; irregular architecture
Vascular criteria	Capillaries directed to luminal epithelium without leakage of fluorescein	Twisted and irregular vessels; elongated capillaries; capillary leakage