Table 3. Gastric EC classification.

Classification	Structure	Nuclei
EC1 (non-neoplastic)	Regularly arranged glands with consistent pattern, well-preserved lumen	Uniform pattern of small, round, poorly-stained nuclei with homogenous size
EC2 (adenoma)	Recognizable glandular structure, more compact arrangement with lumen narrowing (slit-like lumen)	Small, round, poorly-stained nuclei with pseudostratification
EC3 (cancer)	Distortion and loss of glandular structure, no recognizable lumen	Hyperchromatic, disarranged nuclei with heterogeneity in size and shape, significant swelling of the nuclei = "enlarged nuclear sign"

EC, endocytoscopy.