Table 1.

The major and minor criteria listed by Kaplan et al. [11].

Major criteria	Minor criteria
1. Squamous epithelial lining with a flat interface with the connective tissue wall lacking basal palisading	1. Papillary proliferation of the lining epithelium
2. Epithelium exhibiting variations in thickness along cystic lining with or without epithelial spheres or whorls or focal luminal proliferation	2. Ciliated cells
3. Cuboidal eosinophilic cells or “hobnail” cells	3. Multicystic or multiluminal architecture
4. Mucous (goblet) pools, with or without crypts lined by mucous-producing cells	4. Clear or vacuolated cells in the basal or spinous layers
5. Intraepithelial glandular, microcystic, or duct-like structures