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.