An acidic environment at the antrum causes metaplasia of the duodenal cells, causing duodenal ulcers. In addition, follicles that have formed an antrum are called antral follicles or Graafian follicles. The pyloric glands are located in the antrum of the pylorus. Mural granulosa cells line the follicular wall and surround the fluid-filled antrum. Near the pylorus lie "pyloric glands" and are located in the antrum of the pylorus. The follicular antrum is the portion of an ovarian follicle filled with follicular fluid. The "pyloric antrum" is the initial portion of the pylorus. OAC refers to an abnormal connection between the oral cavity and antrum (or maxillary sinus). Granulosa and theca cells continue to undergo mitosis concomitant with an increase in antrum volume. Granulosa and theca cells continue to undergo mitotis concomitant with an increase in antrum volume. Type B gastritis primarily affects the antrum, and is more common with "H. pylori" infection. Finally before ovulation, a tertiary follicle is formed containing a follicular-fluid filled antrum. Theca of follicle, antrum and liquor folliculi are also contained in the follicle. The Billroth II always follows resection of the lower part of the stomach (antrum). "Antrum" made its world premiere at the Brooklyn Horror Film Festival on October 14, 2018.