Class

Findings

I

No abnormal findings.

II

Inflammatory findings or reactive changes because of an intrauterine device(IUD).

IIb

Papillary clusters with few structural abnormalities.
Complex hyperplasia not fully suspected but follow-up necessary.

III

Papillary clusters accompanied by structural abnormalities.
Complex hyperplasia suspected.

IV

Small number of arborescent clusters.
Complex hyperplasia with atypiaor worse suspected.

V

Clear glandular cavity with back-to-back structures and arborescent clusters.  Endometrial cancer diagnosed.

Table 1: Different classes of cytologic findings of the endometrium.