<unk> al<unk>  means that the opening in the<unk>  (the endocervical canal) is more narrow than is typical. In some cases, the endocervical canal may be completely closed. A<unk>  is any passage in the body that is more narrow than it should typically be.
Stenosis of uterine cervix
Cervical mucus plug
Chronic deciduitis
Endometrial polyp
Vaginal yeast infection
Endometrial stromal nodule
Immature ovum
Vaginal trauma