What to expect from pelvic ultrasound for an imperforate hymen

An imperforate hymen is a membrane that covers the vaginal opening. When menstrual fluid cannot leave, it may collect in the vagina and sometimes the uterus, causing pelvic pressure or pain. Ultrasound can show this fluid and provide information about the uterus, cervix and ovaries. It may be performed over the lower abdomen; a full bladder can improve the view. The team should explain each step and protect privacy, particularly for a child or teenager.

Ask the imaging centre whether a full bladder is required and wear comfortable clothing. Tell the sonographer about pain, bleeding, difficulty passing urine, or concerns about an internal scan. An abdominal scan involves gel on the lower abdomen and a handheld probe. An internal scan is not automatically needed and should only occur with appropriate consent, explanation and clinical reason. Bring a trusted adult if that helps the patient feel comfortable, while preserving the patient’s choices where applicable.

Keep the follow-up appointment even if the scan feels reassuring. The images are reviewed with symptoms and examination findings, and a specialist may discuss a small procedure to create an opening if obstruction is confirmed.

Seek urgent care for severe or rapidly increasing pelvic pain, repeated vomiting, fever, fainting, a very swollen abdomen, or inability to pass urine. These symptoms can indicate significant pressure or another urgent pelvic problem. New heavy bleeding, dizziness or worsening pain after a procedure also needs prompt medical advice.

Ask which ultrasound approach is planned, whether the bladder should be full, what the images show, how consent and privacy will be handled, and what follow-up is needed.