How Is an Ovarian Biopsy Performed and What to Expect

An ovarian biopsy is a procedure in which a small piece of ovarian tissue is removed for examination under a microscope or for preservation. Depending on why it is being done, the tissue may be collected through a minimally invasive surgical approach (laparoscopy) or with a needle guided by ultrasound imaging. Most ovarian biopsies are outpatient procedures with low complication rates, but the specifics of preparation, anesthesia, and recovery depend on which technique your medical team chooses and the underlying reason for the biopsy.

Why an Ovarian Biopsy Might Be Recommended

There are two broad reasons a doctor would suggest an ovarian biopsy, and they lead to quite different procedures. The first is diagnostic: your medical team needs to identify what a suspicious mass or growth on or near the ovary actually is. Image-guided biopsy using ultrasound or CT guidance is valuable for planning treatment in women with suspected ovarian cancer, especially when the disease appears too advanced for immediate surgery or when a woman has a history of another cancer whose spread could look like ovarian cancer on imaging alone.¹ Getting a tissue sample allows pathologists to confirm the exact type of cancer, which determines the best chemotherapy regimen.

The second reason is fertility preservation. When a young woman or girl is about to undergo cancer treatment that could damage the ovaries, surgeons may remove a portion of ovarian cortex (the outer layer rich in immature eggs) so the tissue can be frozen and potentially transplanted back later. This is called ovarian tissue cryopreservation. There is also a third, less common scenario: ovarian biopsy has been proposed as a way to estimate how many eggs a woman has left (her “ovarian reserve”), but a systematic review concluded that this should not be used as a routine fertility test because eggs are distributed unevenly within the ovary, making a small sample unreliable.²

Ultrasound-Guided Needle Biopsy

When the goal is to diagnose a pelvic mass, a needle biopsy guided by ultrasound is often the least invasive option. The most common approach is transvaginal: a specially equipped ultrasound probe is inserted through the vagina, giving the doctor a close-up, real-time view of the ovary or mass. A thin needle, typically 18-gauge, is passed through a guide attached to the probe and into the target tissue.³ An automatic biopsy gun fires the needle forward to capture a tiny cylinder of tissue. In some cases the approach is transabdominal (through the belly wall) instead of transvaginal, depending on where the mass sits.

You can expect local anesthesia for this type of biopsy. The area where the needle enters is numbed, and while you may feel pressure or a brief sharp sensation when the needle fires, the procedure itself usually takes only minutes. A recent systematic review pooling data from over 1,500 ultrasound-guided biopsies found that about 95% of samples were adequate for diagnosis on the first attempt, rising slightly higher after a second pass if needed.⁴ That high success rate means most women get a clear diagnosis without needing a repeat procedure or a more invasive surgical biopsy.

One concern that has historically made some doctors hesitant about needle biopsy of ovarian masses is the theoretical risk of rupturing a cyst or seeding malignant cells along the needle track.⁵ In practice, when the biopsy targets a solid mass rather than a fluid-filled cyst, and when it is performed by an experienced operator, this risk is very low. Your medical team will weigh the risk of needle biopsy against the risk of going straight to surgery, particularly if your health makes a larger operation dangerous.

Laparoscopic Ovarian Biopsy

Laparoscopy is the more common route when the purpose is fertility preservation, though it is also used diagnostically in certain situations. Under general anesthesia, the surgeon makes two or three small incisions (usually at the navel and one or two near the hip bones), inflates the abdomen with carbon dioxide gas to create a working space, and inserts a camera along with slender instruments. One study of 85 patients found the median operating time for laparoscopic ovarian tissue harvesting alone was about 30 minutes, with a range of 10 to 75 minutes depending on complexity.⁶

When tissue is being collected for cryopreservation, the surgeon typically makes a shallow incision along one end of the ovary and peels away a strip of the outer cortex, which is where the immature eggs live. A technique described as “medulla-sparing” aims to take the cortex while avoiding damage to the deeper vascular core of the ovary, which helps preserve blood supply and future ovarian function.⁷ An alternative tool called a round biopter can be used to punch out small circular samples roughly 5 mm across and 2–3 mm deep; in one series, five to six such samples were collected per patient, and no adhesions were seen when the same patients had a follow-up laparoscopy later.⁸ Bleeding at the biopsy site is controlled with gentle bipolar cautery.

In some cases, particularly in younger patients or when the clinical situation requires it, the entire ovary is removed (a unilateral oophorectomy) rather than just a biopsy strip. This is more common in pediatric programs, where the procedure is often timed to coincide with another surgery the patient already needs, such as placement of a central venous port for chemotherapy.⁹ After the ovary is retrieved, a small punch biopsy is taken and sent to pathology to check for any microscopic cancer cells.

Anesthesia and What the Procedure Feels Like

Needle biopsies under ultrasound guidance are typically done with local anesthesia. You will be awake and may feel pressure, cramping, or a quick poke. Laparoscopic biopsies usually require general anesthesia, which means you are fully asleep. However, some gynecological centers perform minor laparoscopic procedures under conscious sedation instead. In that approach, a combination of intravenous sedation and local anesthetic injected at the incision sites and around the cervix keeps pain manageable while the patient remains breathing on her own.¹⁰ The choice between general anesthesia and sedation depends on the procedure’s complexity, your overall health, and the surgical team’s experience.

Regardless of the anesthesia type, you should not feel pain during the biopsy itself. After the procedure, mild to moderate cramping and soreness at the incision sites (for laparoscopy) or vaginal discomfort (for transvaginal biopsy) is normal and usually manageable with over-the-counter pain relievers. Shoulder-tip pain from the carbon dioxide gas used during laparoscopy is a well-known annoyance that generally fades within a day or two as the gas is absorbed.

Recovery and What to Expect Afterward

Most ovarian biopsies are same-day procedures. After a needle biopsy, you can usually go home within a few hours once the medical team has confirmed there is no immediate bleeding. For laparoscopic biopsy, recovery in the surgical center may take a few hours longer while the anesthesia wears off. In a large series of operative gynecological laparoscopies that included ovarian biopsies among other minor procedures, the overall complication rate was under 1%.¹¹

During the first few days at home, expect mild bloating, light vaginal spotting, and soreness around the incision sites. Most doctors advise avoiding heavy lifting, strenuous exercise, and sexual intercourse for about one to two weeks. The small laparoscopic incisions are closed with dissolvable stitches or adhesive strips and heal quickly. Results from pathology usually come back within one to two weeks, though this varies by laboratory.

Risks and Complications

Serious complications from ovarian biopsy are uncommon. A large German network that tracked over 1,300 laparoscopic ovarian tissue removals for fertility preservation reported surgical complications in only two cases, a rate of roughly 0.2%, comparable to the risk profile of standard laparoscopy.¹² The risks that do exist include:

Bleeding: The ovary has a rich blood supply. In rare cases, bleeding from the biopsy site can require a return to the operating room. One documented case involved a pediatric leukemia patient who developed delayed intra-abdominal bleeding nearly three weeks after biopsy, complicated by her underlying bone marrow condition.¹³
Infection: As with any procedure that breaks the skin or enters a body cavity, infection is possible but rare.
Injury to nearby structures: Laparoscopic instruments operate near the bowel, bladder, and blood vessels. Large series report bowel, vascular, and urinary tract injuries in well under 1% of cases.
Port-site reactions: Minor skin reactions at the incision sites, such as contact dermatitis from wound-care products, have been reported.

Patients with blood disorders, low platelet counts, or who are on blood-thinning medications deserve extra attention from the surgical team, as their risk of bleeding complications is higher.

What Happens to the Tissue After It Is Removed

The tissue’s destination depends on the reason for the biopsy. Diagnostic specimens go to a pathology laboratory, where they are preserved in formalin, embedded in wax, sliced into thin sections, stained, and examined under a microscope. Pathologists look for the specific cell type and origin of any cancer, which guides treatment decisions. In cases where fallopian tube tissue is also removed, many laboratories now use a detailed sectioning protocol to inspect the full length of the fimbriae, since many cancers previously attributed to the ovary are now known to originate in the fallopian tube.¹⁴

Tissue intended for fertility preservation follows a different path. The ovarian cortex is trimmed into thin strips, immersed in a cryoprotectant solution (commonly containing dimethyl sulfoxide, or DMSO), and slowly cooled in a programmable freezer before being stored in liquid nitrogen at extremely low temperatures.¹⁵ Optimized freezing protocols have been developed that bring the tissue through carefully controlled temperature steps to avoid ice-crystal damage.¹⁶ The frozen tissue can be stored for years, potentially decades, until the patient is ready to use it.

Transplanting Cryopreserved Ovarian Tissue Back

If a woman who had ovarian tissue frozen before cancer treatment wants to restore her fertility or hormone production, the tissue can be thawed and surgically transplanted back, usually onto the remaining ovary or into a pocket created near it. A large meta-analysis that pooled individual patient data found that after transplantation, three-quarters of women saw their estrogen levels rise to functional levels, and the hormone changes associated with menopause (high FSH, low estrogen) reversed in the majority within roughly four to five months.¹⁷ This means the transplanted tissue can both produce hormones and, in many cases, support natural conception or assisted reproduction. Live births have been reported from tissue that was frozen more than a decade earlier.

The approach has been through rapid evolution since the first successful restoration of ovarian function from cryopreserved tissue was reported in 2000, with the first embryo development following in 2004. Multiple surgical routes and transplantation sites have been tried, and the optimal technique is still being refined.¹⁸

Considerations for Children and Adolescents

For girls who have not yet reached puberty, ovarian tissue cryopreservation is currently the only option for fertility preservation before gonadotoxic treatment, since egg freezing requires hormonal stimulation that prepubertal patients cannot undergo. Pediatric programs typically remove an entire ovary rather than just a strip, and the procedure is often combined with another surgery the child already needs to avoid an additional round of anesthesia.⁹

There is an ongoing conversation among pediatric oncologists about how to frame ovarian tissue cryopreservation for families. A qualitative study of Canadian and French pediatric oncologists found that all participants viewed fertility preservation as a fundamental right, but their assessment of the procedure’s status varied: French oncologists largely considered it standard of care, while many Canadian counterparts still viewed it as experimental, partly because of concerns about potentially reintroducing cancer cells when the tissue is transplanted back.¹⁹ This is worth knowing because the information you receive and the options you are offered may differ depending on where you live and which institution you are at.

On the emotional side, the decision to pursue ovarian tissue cryopreservation is understandably stressful, especially when it has to be made quickly before cancer treatment starts. However, research with families who went through the process found that most felt in control of their decision and reported relatively little emotional disturbance from the experience itself.²⁰ Adequate information and a supportive care team make a real difference. A separate editorial noted that in many cases, information about fertility preservation techniques is still not adequate, which can add unnecessary anxiety.²¹

Emerging Alternatives to Surgical Biopsy

For ovarian cancer diagnosis specifically, researchers are working on ways to reduce the need for invasive tissue sampling altogether. Liquid biopsy is a developing technology that analyzes a standard blood draw for traces of tumor DNA, proteins, and other molecular markers shed by cancer cells into the bloodstream. It is less intrusive than any tissue biopsy, and because blood draws can be repeated easily, it offers the possibility of tracking how a cancer changes over time.²²

Alongside liquid biopsy, advances in artificial intelligence applied to ultrasound imaging are improving the ability to distinguish benign from malignant ovarian masses without any biopsy at all. Deep learning algorithms trained on large datasets of transvaginal ultrasound images can identify patterns that may escape the human eye.²³ Neither liquid biopsy nor AI-assisted imaging has replaced tissue biopsy as the gold standard for definitive diagnosis yet, but they are moving closer to clinical use and could eventually spare many women from invasive procedures.

Why Ovarian Biopsy Is Not Used to Count Your Remaining Eggs

You might come across the idea that a small biopsy could tell you how many eggs you have left. Researchers have explored this by counting primordial follicles in ovarian biopsy samples and extrapolating to the whole ovary. The problem is that eggs are scattered unevenly and randomly through ovarian tissue. A biopsy from one part of the ovary might find dozens of follicles while a sample from another spot in the same ovary finds almost none.² Because of this patchiness, the count from a biopsy does not reliably reflect the total number of eggs remaining. Blood tests for anti-Müllerian hormone (AMH) and ultrasound-based antral follicle counts remain the standard, less invasive ways to estimate ovarian reserve.