They have also found application in the management of hymenal stenosis. Other structures that resemble vaginal cysts are connective tissue tumors, hematocolpos, and hymenal atresia. Sometimes a small border of hymenal tissue is left around the opening of the vagina. Their hymenal opening tends to be annular (circumferential). In adolescents, the hymenal opening can naturally extend and variation in shape and appearance increases.