Which cervical/os feature is described as a narrowing of the cervical opening that can affect fertility?

• A. Stenotic cervical os
• B. Cervical infection
• C. Cervical ectropion
• D. Cervical polyps

Answer: (A)

The main idea here is a structural narrowing of the cervical opening that can block the passage of sperm and thus affect fertility. A stenotic cervical os is exactly that: a narrowed opening of the cervix, which can hinder sperm from entering the uterus and, in some cases, impede menstrual flow or related processes. This makes it a direct cause of fertility issues when the opening is too tight for normal sperm passage or embryo movement.

Cervical infection describes inflammation from pathogens. While infections can contribute to infertility through mechanisms like pelvic inflammatory disease, they do not define a narrowing of the cervical opening. Cervical ectropion is when glandular cells from the endocervical canal appear on the outer cervix due to hormonal effects; it changes appearance but does not create a narrowed os. Cervical polyps are benign growths arising from the cervical canal that can cause bleeding or discharge but again do not describe a narrowed cervical opening.

So the concept tested is a physical narrowing of the cervical opening itself, which directly relates to how sperm can reach the uterus and thus to fertility.