We report 13 cases of a previously undescribed pseudoneoplastic lesion of the uterine cervix, which we have designated "lobular endocervical glandular hyperplasia, not otherwise specified." The patients' ages ranged from 37 to 71 years (mean, 45 years; median, 49 years). Three (27%) patients had a history of hormone use. Seven lesions were incidental findings in hysterectomy specimens. In the six other cases, the patient came to clinical attention because of a mucoid cervical discharge (two cases), increased vaginal discharge (two cases), abdominal discomfort (one case), or a 3.5-cm cervical mass found when being examined because of ovarian carcinoma (one case); hysterectomy was performed in each of these six cases. Microscopic examination showed a distinctly lobular proliferation of small to moderately sized rounded glands often centered around a larger central gland. The lobular proliferation was well to poorly demarcated and usually confined to the inner half of the cervical wall. Glands within the lobules were usually separated from each other by unaltered or hypercellular cervical stroma and were lined by columnar mucinous cells similar to the normal endocervix. Occasional reactive atypia of the endocervical cells and mitoses were seen, but no significant cytologic atypia was identified. Neither of the two cases stained showed cytoplasmic immunoreactivity for carcinoembryonic antigen. Follow-up of seven patients showed no evidence of recurrence of the cervical lesion, with an average length of follow-up of 3.4 years; three patients were lost to follow-up and three cases are recent. The principal consideration in the differential diagnosis was adenoma malignum (minimal deviation adenocarcinoma). The features most helpful in this distinction, in addition to the orderly lobular arrangement of the glands, were a lack of the following: irregular stromal infiltration, a desmoplastic stromal response, and focal malignant cytologic features. Lobular endocervical gland hyperplasia should be added to the list of previously described pseudoneoplastic glandular lesions of the cervix and, like them, not misinterpreted as neoplastic.