Have you been told you have phleboliths?
First, take a breath. In most cases, phleboliths are not dangerous, not cancer and not something that needs to be “removed” just because they showed up on an X-ray or CT scan.
That said, I completely understand why the word looks a little alarming on a radiology report. Read on to learn what phleboliths are, why they form, when they matter and what you can do if they are causing symptoms.
Phlebolith Facts
Doctors first noticed phleboliths during autopsies in the 19th century, and for years there was plenty of debate about what they meant. Today, they are generally understood as small calcifications that form inside veins, most often in the pelvis.
Phleboliths are common in adults, especially as we get older, and older radiology teaching resources have estimated that they may be seen in about 30% of Americans over age 40.
They are much less common in children. One study looking at pelvic phleboliths in pediatric patients found them in only about 1 in 800 cases.
What Are Phleboliths?
A phlebolith, sometimes called a phlebolite, is a small “stone” or calcified deposit that forms within a vein. Think of it as a tiny, hardened area that can develop after a small blood clot or slow-moving blood in a vein becomes calcified over time.
Phleboliths are most often found in the lower pelvis, where they may appear as small round or oval spots on imaging. Less often, they may be seen in other areas, including the stomach, intestines or scrotum.
In general, they are small, often around 2 to 5 millimeters in diameter. And yes, that is about as tiny as it sounds.
Most phleboliths are found by accident when a person has an X-ray, CT scan or other imaging test for an unrelated reason. As noted in radiology resources such as Radiopaedia, pelvic phleboliths are usually an incidental finding.
Phleboliths themselves are relatively common and are usually not a cause for concern. The bigger question is whether they are linked to something else going on in the body.
For example, people with certain pelvic vein problems, varicose veins or venous malformations may be more likely to have phleboliths. Some older research has also noted associations with conditions such as diverticulitis, though that does not mean phleboliths cause diverticulitis.
Interestingly, one older report in The Lancet suggested that phleboliths may be seen more often in economically developed countries. But again, this is one of those medical details that is more useful to researchers than to the person sitting at home wondering if they should panic. Short answer: usually no.
Are Phleboliths Dangerous?
Most of the time, no. Phleboliths are usually benign, which means they are not cancerous and do not typically create a serious health problem on their own.
The catch is that they can sometimes be confused with other things on imaging, especially kidney stones or ureteral stones. This is why radiologists look carefully at the location, shape and appearance of the calcification before deciding what it most likely represents.
Phleboliths also may appear in people with venous malformations, which are abnormal clusters or formations of veins. In that case, the phlebolith is not the main issue; the underlying vein abnormality is.
What Causes Phleboliths?
Phleboliths are thought to form when blood flow in a vein becomes sluggish, a tiny clot forms and that clot gradually calcifies. In plain English, slow blood flow plus time can sometimes equal a little calcium “stone” inside the vein.
A number of factors may contribute, including:
- Aging. Phleboliths become more common with age. Not exactly a fun party favor of getting older, but a common one.
- Venous stasis. This means blood is moving slowly through the veins. Sluggish flow can make small clots more likely to form, and some of those may later calcify.
- Varicose veins. Varicose veins are enlarged, twisted veins that may develop when vein valves do not work as well as they should. Over time, poor flow in these veins may contribute to small clots or calcifications.
- Straining with bowel movements. Chronic constipation and frequent straining can increase pressure in the pelvic area. That pressure may play a role in vein changes over time, although it is rarely the only factor.
- Venous malformations. Veins normally have interior walls lined with tissue called the endothelium, but venous malformations can occur when veins develop abnormally. These areas may be more likely to contain phleboliths.
- Prior vein injury or inflammation. Trauma, irritation or inflammation in a vein may, in some cases, contribute to clotting and later calcification.
- Liver or portal vein-related disease. Phlebolith-like calcifications can sometimes be seen in abdominal veins in people with certain liver or vascular conditions, although pelvic phleboliths remain the most common type.
Important to note: having a phlebolith does not automatically mean you have a blood clot right now. Many phleboliths are old, stable calcifications and not active clots.
Symptoms of Phleboliths
Most people with phleboliths have no symptoms at all. They are often discovered only because a scan was ordered for back pain, abdominal pain, urinary symptoms or something else entirely.
When symptoms are present, they may include pain or discomfort in the lower back, abdomen, pelvis or groin. However, in many cases the pain is not caused by the phlebolith itself, but by another condition that happened to show up on the same imaging test.
This is where things can get confusing. Phleboliths can look similar to kidney stones on a plain X-ray, and both can appear in the pelvic area.
A kidney stone or ureteral stone is more likely to cause sharp, severe pain, pain that comes in waves, nausea, blood in the urine or urinary urgency. A phlebolith is more likely to just sit there quietly, minding its own business.
Another possible issue related to veins is thrombosis, which means a blood clot has formed inside a blood vessel. A clot in the leg may cause swelling, warmth, redness, tightness or pain, and that deserves medical attention.
Again, a phlebolith is usually an old calcified finding, not a newly formed clot. But if you have new swelling, significant pain or one leg suddenly looks different from the other, don’t try to self-diagnose that from your couch.
How Are Phleboliths Diagnosed?
Phleboliths are usually diagnosed with imaging, such as an X-ray, CT scan, ultrasound or MRI. CT scans are especially helpful when doctors need to separate phleboliths from urinary tract stones.
Radiologists may look for certain signs, such as a small central lucency, sometimes described as a clear center, or a “comet-tail” appearance that can suggest a phlebolith rather than a kidney stone. That sounds much more dramatic than it usually is.
Your health care provider may also consider your symptoms, urine test results and the exact location of the calcification. For example, blood in the urine and severe one-sided flank pain may push the evaluation more toward a urinary stone.
When Should I See a Doctor?
Phleboliths that are causing pain or are found during an evaluation for pain should be discussed with a health care provider. Even if the phlebolith is harmless, the symptom that led to the scan may still need an explanation.
Seek medical care promptly if you have severe pelvic, abdominal, back or flank pain, blood in the urine, fever, vomiting, new leg swelling, chest pain or shortness of breath. Those symptoms may point to something more urgent than a phlebolith.
Also see a doctor if you have a history of phleboliths and experience rectal bleeding. In rare cases, phleboliths may be seen in people with hemangiomas or venous malformations in the colon or rectum.
Some patients who have phleboliths along with cutaneous hemangiomas may need evaluation for hemangiomas of the colon or rectum, especially when rectal bleeding is present.
A hemangioma is an abnormal collection of blood vessels that often behaves like a benign tumor. These are more common on the skin, but can rarely occur in the gastrointestinal tract.
How Do You Treat Phleboliths?
Here is the part that surprises many people: most phleboliths do not need treatment. Treating an incidental phlebolith just because it exists would be a little like replacing the whole kitchen because you found one crumb on the counter.
Treatment depends on whether you have symptoms and, more importantly, what is actually causing those symptoms. Often, the care plan is focused on the underlying vein problem, urinary stone, pelvic condition or other issue, not the phlebolith itself.
Mild Cases
For mild discomfort that your health care provider believes is related to local inflammation or a vein issue, conservative care may be recommended. This may include warm compresses, over-the-counter pain relievers or anti-inflammatory medication, if these are safe for you.
A warm washcloth over the uncomfortable area may help ease soreness. Elevating the affected area can be helpful for some vein-related discomfort, although this is much more practical for a leg than for the pelvis, obviously.
Do not start anti-inflammatory medicines such as ibuprofen or naproxen without checking first if you have kidney disease, stomach ulcers, take blood thinners or have been told to avoid them. This is one of those times when “it’s over the counter” does not automatically mean “it’s right for everyone.”
More Severe Cases
More involved treatment is usually reserved for people who have painful varicose veins, venous malformations or other vein problems associated with phleboliths. Options may include endovenous laser therapy, sclerotherapy or, rarely, surgery.
- Endovenous Laser Therapy: This treatment uses heat from a laser fiber to close off a problematic vein. It is commonly used for varicose veins and is typically performed as a minimally invasive procedure.
- Sclerotherapy: During sclerotherapy, a clinician injects a medication called a sclerosant into the abnormal vein, causing it to shrink and close. To be clear, the medication is not a radioactive dye; it is a solution designed to irritate and close the vein lining.
- Surgical Excision: Surgery is generally used only in select cases, such as a painful venous malformation or another condition that has not responded to less invasive options. Because it is more invasive and requires recovery time, it is usually not the first choice.
For venous malformations, treatment may involve a vascular specialist, interventional radiologist or surgeon. As noted by organizations such as Johns Hopkins Medicine, venous malformations are often managed based on size, location, symptoms and complications.
Can Phleboliths Be Prevented?
There is no guaranteed way to prevent phleboliths, especially because age, anatomy and vein structure all play a role. I know, not the most satisfying answer, but it is the honest one.
Still, supporting healthy circulation and reducing unnecessary pressure in the pelvic area may help lower your risk of vein-related issues.
» Avoid overly tight clothing, especially around the waist and lower abdomen.
» Avoid sitting still for long periods. Get up, stretch or walk around every 30 to 60 minutes when possible.
» Drink enough fluids to help prevent dehydration and constipation.
» Eat fiber-rich foods, such as fruits, vegetables, beans, lentils and whole grains, to help reduce straining with bowel movements.
» Move your body regularly, since walking and leg movement help support healthy blood flow.
» Talk with your doctor about varicose veins, pelvic vein symptoms or venous malformations if you have ongoing discomfort.
As a bonus, most of these habits are good for general health anyway. We love a multitasker.
Are There Scientific Studies on Phleboliths?
Yes, but many of the studies are case reports, imaging reviews or research related to venous malformations. In other words, they are often written for radiologists, surgeons and other medical professionals, not exactly light bedtime reading.
You can find many of these papers through the U.S. National Institutes of Health website. Just don’t be surprised if the language gets very technical very quickly.
Bottom Line
Phleboliths are small calcifications inside veins, and they are most often found in the pelvis. In most adults, they are harmless, incidental findings that do not need treatment.
The more important issue is whether your symptoms are actually coming from something else, such as a kidney stone, urinary tract problem, pelvic condition, varicose vein or venous malformation. That is why it is worth reviewing your imaging results with a health care provider rather than trying to decode a radiology report on your own.
» See your health care provider if you have bladder, kidney, lower abdominal, lower back or pelvic pain.
» Seek urgent care for severe pain, fever, vomiting, blood in the urine, new leg swelling, chest pain or shortness of breath.
» Use warm compresses or anti-inflammatory medications only as recommended and only if they are safe for you.
» Let your health care provider know if symptoms persist or get worse after treatment.
» Support healthy circulation by staying active, staying hydrated, avoiding long periods of sitting and eating enough fiber to reduce constipation and straining.
» Ask whether evaluation for varicose veins, venous malformations or other vascular conditions makes sense in your case.
Most of the time, a phlebolith is simply a small mark of past vein changes, not a medical emergency. But your symptoms still matter, and that is where a good medical evaluation comes in.
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