Why Is My Right Ovary Not Visible On Ultrasound?

Your right ovary might not show up on an ultrasound for several straightforward reasons. The most common cause is bowel gas blocking the sound waves. The right ovary also sits near the cecum and appendix, and that part of the bowel can create shadowing. Other possibilities include the ovary being tucked behind the uterus, behind the bladder, or positioned higher than usual. In some cases, the ovary has been removed during prior surgery, even if you do not recall being told. Postmenopausal ovaries are smaller and harder to see. Most often this finding is normal and not a cause for concern, but it does require follow‑up to confirm.

What does it mean if one ovary is not visible on ultrasound?

It means the ultrasound did not clearly image that ovary during the exam. That does not automatically mean the ovary is abnormal or absent. The ultrasound machine creates images from sound waves that bounce off tissues. If something blocks the sound waves—like gas, stool, or bone—the ovary can be hidden. Also, the ovary may be in an unexpected location, such as higher in the pelvis or behind the uterus. A follow‑up exam, often with a transvaginal ultrasound, usually finds the ovary. If it is still not seen, additional imaging like CT or MRI may be considered, but this is not common.

Can bowel gas hide an ovary on ultrasound?

Yes, bowel gas is the most common reason an ovary is not visible. Gas reflects sound waves strongly, creating an acoustic shadow that blocks deeper structures. The right ovary is located near the cecum, the beginning of the large intestine. Gas or stool in this area can completely hide the ovary. Drinking water before an exam can help reduce gas, but some gas remains. Your technologist may ask you to change positions or press on your abdomen to move the gas. A transvaginal ultrasound often bypasses bowel gas because the probe is placed inside the vagina, closer to the ovaries.

Is it normal to only see one ovary on ultrasound?

Yes, it is fairly common. In premenopausal women, a single ovary may be seen in about 10‑20% of exams, depending on the study cited. The missing ovary is usually found on repeat scanning or with a different imaging approach. It is not automatically a sign of disease. However, if you have pelvic pain, irregular bleeding, or a history of ovarian cysts, the doctor will want to ensure the unseen ovary is normal. If you have had prior pelvic surgery, one ovary may have been removed without your knowledge—for example, during a hysterectomy or cyst removal. Checking your surgical records can clarify this.

What factors make the right ovary harder to see on ultrasound?

Several factors can make the right ovary more difficult to image than the left. The right ovary often lies near the cecum and appendix, which frequently contain gas. The left ovary is near the sigmoid colon, which can also have gas, but sometimes the right side is more affected. If your uterus is tilted to the right (dextroversion), the right ovary may be tucked behind it. Scar tissue from prior surgeries on the right side, like an appendectomy, can tether the ovary in a poor position for ultrasound. Body habitus matters too—more abdominal fat can weaken sound waves. And if you are postmenopausal, smaller ovary size reduces visibility.

Could the right ovary be missing or surgically removed?

Yes, it is possible you had a right oophorectomy without knowing. Some women are told they had “ovarian cyst removal” or “tubal ligation,” but the surgeon may have also removed the ovary. However, this is rare without your knowledge. A more common scenario is that the ovary was removed during a hysterectomy, even if you kept one or both ovaries. Check your surgical records or ask your doctor to review them. If no surgery was ever done on that side, congenital absence of an ovary is extremely rare—about 1 in 11,000 births. So the ovary is almost certainly present but just hidden on the ultrasound.

What should I do if my right ovary is not seen on ultrasound?

First, do not panic. Most of the time it is a normal variant. Ask your doctor if a transvaginal ultrasound is appropriate. This exam provides a clearer view of the ovaries and often finds the one that was missed. If the ovary remains unseen and you have no symptoms, many doctors will simply monitor with a repeat ultrasound in a few months. If you have pelvic pain, a lump, or abnormal bleeding, your doctor may order a CT scan or MRI to look for the ovary and rule out problems like a large cyst or ovarian torsion. In most cases, the ovary is healthy and just hiding.