What causes ovarian torsion

What is Ovarian Torsion?

Ovarian torsion is a gynecological emergency that occurs when an ovary, and sometimes the fallopian tube, twists on the ligaments that support it. This twisting action can cut off the blood supply to the ovary, potentially leading to tissue death if not treated promptly. The condition is characterized by sudden onset of severe pelvic pain, often accompanied by nausea and vomiting.

What Causes Ovarian Torsion?

The primary cause of ovarian torsion is the presence of an abnormality within the ovary that makes it more prone to twisting. This abnormality is most frequently an ovarian cyst or mass. These cysts can vary in size and composition, ranging from benign functional cysts (like follicular or corpus luteum cysts) to larger, more complex tumors (such as dermoid cysts, cystadenomas, or even malignant tumors). The weight and size of these masses can cause the ovary to become unbalanced and more susceptible to twisting on its vascular pedicle (the stalk containing blood vessels).

Ovarian Cysts and Masses

Ovarian cysts are fluid-filled sacs that develop on or within the ovary. Most ovarian cysts are benign and resolve on their own without treatment. However, some cysts can grow quite large, increasing the risk of torsion. For instance, dermoid cysts, which are a type of germ cell tumor, are often found in younger women and are a common culprit in ovarian torsion due to their typical size and density. Cystadenomas, which arise from the surface cells of the ovary, can also become very large and heavy, predisposing to torsion.

Other Contributing Factors

While ovarian cysts are the leading cause, other factors can contribute to the likelihood of torsion. These include:

• Previous Ovarian Surgery: Scar tissue from previous surgeries might alter the ovary's position or mobility.
• Pregnancy: During pregnancy, the corpus luteum (a temporary gland formed after ovulation) can be enlarged and increase the risk of torsion, especially in the first trimester.
• Assisted Reproductive Technologies (ART): Treatments like IVF can lead to the development of multiple or enlarged follicles, increasing the risk of torsion, particularly in cases of ovarian hyperstimulation syndrome (OHSS).
• Congenital Abnormalities: In rare cases, anatomical variations in the ligaments supporting the ovary might play a role.

Who is at Risk?

Ovarian torsion can affect women of all ages, but it is most common in women of reproductive age (typically between 20 and 50 years old). This is because women in this age group are more likely to develop ovarian cysts. Adolescent girls are also at risk, and torsion can occur even in premenarchal girls. Pregnant women and those undergoing fertility treatments have a slightly elevated risk.

Symptoms of Ovarian Torsion

The hallmark symptom of ovarian torsion is sudden, severe, and sharp pain in the lower abdomen or pelvis. This pain is often unilateral (affecting one side) but can sometimes be felt on both sides. Other common symptoms include:

• Nausea and vomiting
• Fever (less common)
• A palpable mass in the abdomen (rarely felt by the patient)
• Changes in bowel or bladder habits

The pain can be intermittent initially as the ovary twists and untwists, but it typically becomes constant and severe.

Diagnosis and Treatment

Diagnosing ovarian torsion promptly is crucial. A doctor will typically perform a pelvic exam and may order an ultrasound, which is the primary imaging tool used to visualize the ovary and detect potential masses or signs of reduced blood flow. Doppler ultrasound can assess blood flow to the ovary.

Treatment for ovarian torsion is almost always surgical. The goal of surgery is to untwist the ovary (detorsion) and save it, if possible. If a cyst or mass is present, it will usually be removed. In cases where the ovary is severely damaged due to prolonged lack of blood flow or if there is a malignant tumor, the ovary (and sometimes the fallopian tube) may need to be removed (oophorectomy or salpingo-oophorectomy).

Potential Complications

If not treated quickly, ovarian torsion can lead to serious complications, including:

• Ovarian necrosis (tissue death)
• Infertility (if the ovary is lost or severely damaged)
• Chronic pelvic pain
• Rupture of the cyst or mass

Prompt medical attention is vital to prevent these severe outcomes and preserve ovarian function.