Subjective histological EIN criteria. All criteria must be fulfilled for a diagnosis of EIN to be made
| EIN criterion | Comments |
|---|---|
| Architecture | Area of glands exceeds that of stroma |
| Cytology | Cytology differs between architecturally crowded focus and background |
| Diameter >1 mm | Maximum linear dimension of the lesion exceeds 1 mm |
| Exclude mimics | Benign conditions with overlapping criteria: basalis, secretory, polyps, repair, etc |
| Exclude cancer | Carcinoma if maze-like meandering glands, solid areas, or appreciable cribriforming |