Table III.

Haematoxylin and eosin section diagnostic criteria for endometrial intraepithelial neoplasia (EIN).

EIN criterion	Comments
Architecture	Area of glands exceeds that of stroma (VPS < 55%)
Cytology	Cytology differs between architecturally crowdedfocus and background
Diameter >1 mm	Maximum linear dimension of the lesion exceeds1 mm
Exclude mimics	Benign conditions with overlapping criteria: basalis,secretory, polyps, repair, etc.
Exclude cancer	Carcinoma if maze-like meandering glands, solidareas or appreciable cribriforming

NB: All criteria must be met in order for a diagnosis of EIN to me made.VPS = volume percentage stroma.Reproduced with permission from Baak and Mutter (2005).