Microglandular hyperplasia has a cytomorphological spectrum overlapping with atypical squamous cells-cannot exclude high-grade squamous intraepithelial lesion (ASC-H).

We retrospectively evaluated cytological interpretations of conventional cervical smears in 48 cases of biopsy-proven microglandular hyperplasia and compared them with 15 negative controls. A glandular pattern was noted in all 48 cases but was predominant in 73% (35/48) of the cases. Immature metaplastic pattern was present in 71% (34/48) and was predominant in 27% (13/48). These features were not observed in negative control smears. 85% of cases (41/48) were interpreted as negative for epithelial cell abnormality. Two cases with predominantly glandular pattern (6%, 2/35) were interpreted as atypical glandular cells. Five cases with predominantly immature metaplastic pattern (38%, 5/13) showed checkerboard arrangement or rows of single cells with slightly larger atypical nuclei leading to interpretation as "atypical squamous cells-cannot exclude high-grade squamous intraepithelial lesion." The metaplastic cells with normoblast-like karyorrhectic apoptotic debris confined to the nuclear area were scattered among these cells in microglandular hyperplasia with metaplastic pattern. Copyright 2004 Wiley-Liss, Inc.