A 20-year-old woman presents to the gynecology clinic with complaints of intermittent vaginal spotting and watery vaginal discharge for the past two months. She denies significant pelvic pain, fever, or a history of sexually transmitted infections. Her mother took diethylstilbestrol (DES) during pregnancy to prevent miscarriage. On pelvic examination, a 2 cm exophytic, irregular, and friable lesion is observed on the anterior vaginal wall near the cervix. No adnexal masses or lymphadenopathy are found. Histopathology: Cells with glycogen-rich cytoplasm Hobnail cells in a tubular and papillary growth pattern Which of the following histological features is characteristic of this carcinoma?
