An adenocarcinoma that arises from the endocervix. It is the most common type of endocervical adenocarcinoma. The neoplastic epithelium shows a pseudostratified architecture and the malignant cells have enlarged, elongated, and hyperchromatic nuclei. The disease is MONDO_0000554 (endocervical adenocarcinoma). Also known as: endocervical adenocarcinoma, usual type, endocervix adenocarcinoma.