Xanthomatous

What Does Xanthomatous Mean?

Xanthomatous means made of, or relating to, a xanthoma. A xanthomatous lesion is a yellowish deposit of fat-laden cells in the skin, a tendon or other tissue.

The word comes from the Greek “xanthos”, meaning yellow, plus “-oma”, meaning a lump or growth. “Xanthomatous” turns that noun into a describing word, so you’ll see phrases like xanthomatous lesion, xanthomatous plaque, xanthomatous nodule or xanthomatous change. They all mean the same thing: tissue containing the fat-filled cells that make a xanthoma.

Xanthomatous lesions range from small, soft yellow spots on the eyelids to firm lumps in tendons and sudden crops of red-yellow bumps on the skin. What they share is how they form: fats carried in the blood leak into tissue and are swallowed by scavenger cells.^[1] Our pages on the xanthoma definition and what a xanthoma is explain the core term.

How Do Xanthoma, Xanthomata, Xanthomatosis And Xanthomatous Differ?

They’re all forms of the same root. A xanthoma is one deposit, xanthomata or xanthomas are several, xanthomatosis is having many, and xanthomatous describes anything made of xanthoma tissue.

• Xanthoma. A single yellow fatty deposit. See our guide to xanthoma.
• Xanthomas or xanthomata. Two plurals for the same thing; xanthomata is the older medical form. See xanthomata.
• Xanthomatosis. A condition with many xanthomas, often from an inherited lipid disorder. See xanthomatosis.
• Xanthomatous. The adjective, describing a lesion, cell or change made of xanthoma tissue.
• Xanthelasma. The name for xanthomatous plaques on the eyelids, the most common type.

Our main guide to xanthomas of every type brings all of these together.

What Does Xanthomatous Mean On A Biopsy Or Scan Report?

It means the tissue contains foam cells, macrophages packed with fat, which is the signature of a xanthoma. It’s a description of what the cells look like, not a diagnosis of cancer.

Under the microscope, xanthomatous tissue shows clusters of pale, bubbly-looking cells. These are macrophages that have taken up so much lipid they look foamy.^[1] In eyelid xanthelasma, these foam cells sit in the deeper layer of the skin, often around small blood vessels.^[2]

Pathologists also use the word for foam cells found in other places, such as the lining of the stomach, which is called gastric xanthoma and is a different condition with its own meaning; our gastric xanthoma guide explains it. If a report uses the word and you’re unsure what it means for you, ask the doctor who ordered the test.

How Do Xanthomatous Deposits Form?

Fat-carrying particles called lipoproteins leak out of small blood vessels into the tissue. Macrophages swallow the fat, turn into foam cells, and gather into a visible yellow deposit.

That’s the shared process behind every xanthoma.^[1] The more fat in the blood, and the longer it stays high, the more of it reaches the tissue. On the eyelids, blinking compresses the tiny vessels, vessels get leakier with age, and a low-grade inflammation adds to the process.^[2]

Repeated pressure may also play a part, which helps explain why tendon and tuberous types favor the Achilles tendons, elbows and knees.^[1] The type of fat that’s raised shapes the type of lesion: very high triglycerides cause eruptive xanthomas, while long-standing high LDL cholesterol causes tendon xanthomas.

What Are The Main Xanthomatous Conditions?

Eyelid xanthelasma, and eruptive, tuberous, tendon, plane and palmar xanthomas. Each has its own look, location and link to blood fats.

• Xanthelasma palpebrarum. Soft yellow plaques on the eyelids, usually near the inner corners.
• Eruptive xanthomas. Crops of small red-yellow bumps that appear suddenly on the buttocks, shoulders and limbs.
• Tuberous xanthomas. Firm yellow lumps over the elbows and knees.
• Tendon xanthomas. Firm nodules inside tendons, especially the Achilles and knuckles.
• Palmar xanthomas. Yellow-orange lines in the creases of the palms and fingers.
• Plane xanthomas. Flat yellow patches, sometimes widespread, on the skin or in skin folds.

Our guide to skin xanthomas shows how the skin types differ, and our page on xanthoma disseminatum covers a rare widespread form.

What Do Eruptive Xanthomas Say About Triglycerides?

They usually mean triglycerides are extremely high, often above 1,000 mg/dL, which also raises the risk of pancreatitis. They need prompt medical attention.

Read moreWhat Doctor Removes Xanthelasma

Eruptive xanthomas appear when triglycerides climb above about 1,000 mg/dL, and uncontrolled diabetes is a common reason triglycerides rise that high.^[4] At those levels, the main danger is inflammation of the pancreas, which can be serious.^[4] Our guides to eruptive xanthoma and eruptive xanthomas in depth cover them fully.

What Do Tendon And Tuberous Xanthomas Mean?

Tendon xanthomas are a classic sign of familial hypercholesterolemia, an inherited condition with very high LDL cholesterol. Tuberous xanthomas also point to raised cholesterol, including dysbetalipoproteinemia.

Familial hypercholesterolemia affects between 1 in 500 and 1 in 250 people, is passed on with a 50% chance to each child, and lists xanthelasma and tendon xanthomas on the Achilles tendons, elbows, hands, knees and feet among its signs.^[3] Without care, about half of men with it had a coronary event by 50 and about 30% of women by 60, and statins are the first-line medicine.^[3]

Tuberous and palmar xanthomas are typical of dysbetalipoproteinemia, a different inherited lipid disorder.^[5] Rarer causes of tendon xanthomas include cerebrotendinous xanthomatosis and sitosterolemia.^[1] Our pages on tendon xanthomata and tuberous xanthoma go further.

What Do Palmar And Plane Xanthomas Mean?

Palmar xanthomas in the hand creases point to dysbetalipoproteinemia. Plane xanthomas can come from lipid disorders, but widespread ones with normal blood fats can be linked with a blood protein disorder.

Palmar xanthomas are a hallmark of dysbetalipoproteinemia, and they fade once the condition is managed.^[5] Diffuse plane xanthomas in people with normal blood fats have been linked with monoclonal gammopathy, an abnormal antibody protein made by one family of blood cells, which is why doctors look further when the lipid results don’t explain them.^[6] Our guides to palmar xanthoma and plane xanthoma explain both.

Is Xanthelasma A Xanthomatous Condition?

Yes. Xanthelasma palpebrarum is the most common xanthomatous condition: soft yellow plaques on the eyelids, often called cholesterol deposits on eyelids or yellow spots on eyelids.

It affects about 1.1% of women and 0.3% of men, appears from about 20 to 70, and is most common between 35 and 55.^[2] About half of people with xanthelasma have a primary or secondary lipid disorder,^[2] which means about half don’t. That makes it a less reliable warning sign than tendon or eruptive xanthomas, but still a reason for a cholesterol check.

The plaques are harmless in themselves and rarely fade by themselves,^[2] so most people who want them gone choose removal. Our main xanthelasma guide covers the eyelid type in depth.

Does A Xanthomatous Lesion Mean You Have High Cholesterol?

Often, but not always. Eruptive, tendon, tuberous and palmar types usually come with abnormal blood fats; eyelid xanthelasma often doesn’t. Only a blood test settles it.

Beyond inherited disorders, several conditions can raise blood fats and lead to xanthomatous deposits. StatPearls lists primary biliary cholangitis, diabetes, an underactive thyroid, nephrotic syndrome, retinoid or estrogen medicines and sarcoidosis among the secondary causes linked with xanthelasma.^[2] In young people, an inherited lipid disorder is more likely.^[2]

The type of lesion gives your doctor a strong hint about which fat to look at, but the numbers come from the lab.

Which Tests Are Done For A Xanthomatous Lesion?

A lipid profile first, then tests for conditions that raise blood fats, such as diabetes, thyroid and liver problems. Imaging or a biopsy is added only when needed.

1. Examination. Often enough to recognize the type of xanthoma.^[1]
2. Lipid profile. Triglycerides and total, LDL and HDL cholesterol.^[1]
3. Sugar tests. Glucose and HbA1c where diabetes is possible.^[1]
4. Liver and thyroid tests. To look for secondary causes.^[2]
5. Imaging. Ultrasound for tendon xanthomas; MRI to rule out other lumps.^[1]
6. Biopsy or further tests. When the picture is unclear, or blood fats are normal with widespread plane xanthomas.^[6]

How Are Xanthomatous Lesions Managed?

By managing the cause, mainly getting blood fats under control with lifestyle changes and medicine. Some lesions shrink as a result; others are removed for appearance or comfort.

Clinical reviews put whole-body management first: optimizing the lipid profile, with statins that may also reduce lesion size and PCSK9-blocking medicines that work well in familial hypercholesterolemia.^[1] Smaller lesions may shrink or resolve once blood fats are controlled.^[1]

Surgery is kept for lumps that cause symptoms or need a biopsy, and partial removal of body xanthomas has a very high recurrence rate.^[1] Eyelid xanthelasma is different: lowering cholesterol protects your heart but usually has only a limited effect on plaques that have already formed,^[2] so removal is the usual route. Our guide on clinic options for xanthomas covers every type.

How Do You Remove Xanthomatous Plaques On The Eyelids?

Read moreHow Long Does Xanthelasma Last For

With laser, an acid peel, radiofrequency or surgery in a clinic, or a cream made for xanthelasma removal at home. A cholesterol check comes first.

Every method has trade-offs on thin eyelid skin. Excision can turn the lid outward or retract it, while freezing and chemical cauterization can scar and discolor the skin.^[2] Plaques can also come back: recurrence is generally under 50%, around 60% after repeat procedures, and higher for deeper plaques.^[2] Our complete guide to xanthelasma removal compares every method, and our page on the xanthelasma cream explains the at-home route.

If your xanthomatous lesions are on your eyelids, you’ve had your cholesterol checked, and you’d like to clear the plaques at home, this is the cream we make for xanthelasma.

When Should You See A Doctor About A Xanthomatous Lesion?

Whenever you notice one for the first time, so the type can be confirmed and your blood fats checked. Some types need prompt attention.

• Sudden crops of small red-yellow bumps. Possible eruptive xanthomas and very high triglycerides; get checked soon.
• Belly pain with eruptive bumps. Seek urgent care, as pancreatitis is a risk.^[4]
• Firm lumps on tendons. Especially with a family history of early heart disease.
• Yellow lines in the palm creases. A sign worth a full lipid workup.
• Widespread flat yellow patches with normal cholesterol. Your doctor may look for a blood disorder.^[6]
• Yellow eyelid plaques. Book a routine cholesterol check, sooner if you’re young.

What Other Related Words Might You See?

Foam cells, lipid-laden macrophages, hyperlipidemia, dyslipidemia and xanthogranuloma are the terms most often seen alongside xanthomatous.

• Foam cells. Macrophages so full of fat they look foamy; the building blocks of every xanthoma.
• Lipid-laden macrophages. Another way of describing foam cells.
• Hyperlipidemia. High levels of fats, such as cholesterol or triglycerides, in the blood.
• Dyslipidemia. Any abnormal pattern of blood fats, including low HDL.
• Xanthogranuloma. A related growth with foam cells and other immune cells, which is a different condition from a simple xanthoma.

If a word in a letter or report isn’t clear, it’s always fine to ask your doctor to explain what it means for you.

What’s The Bottom Line On Xanthomatous Lesions?

Xanthomatous describes yellow deposits of fat-filled foam cells. They range from harmless eyelid xanthelasma to eruptive and tendon xanthomas that signal serious blood fat disorders, so any new one deserves a cholesterol check.

For the eyelid type, Xanthel® is a cosmetic cream made for xanthelasma removal at home, sold by Xanthelasma.com. It’s for eyelid xanthelasma only, not xanthomas on the body. You’ll find it in the box above and at the foot of this page, or read more about Xanthel® xanthelasma removal cream, and browse all our xanthelasma and xanthoma guides.

Common Questions About The Term Xanthomatous

What Does Xanthomatous Mean?

Xanthomatous means made of, or relating to, a xanthoma, a yellowish deposit of fat-laden cells. The word comes from the Greek for yellow.

What Is A Xanthomatous Lesion?

A xanthomatous lesion is a yellow or orange plaque, bump or nodule made of foam cells, which are macrophages packed with fat, in the skin, a tendon or other tissue.

What Causes Xanthomatous Deposits?

Fat-carrying particles leak from small blood vessels into tissue and are swallowed by macrophages, which become foam cells. High blood fats, inherited lipid disorders, diabetes, thyroid and liver conditions can all contribute.

What Are The Main Types Of Xanthomatous Lesions?

Eyelid xanthelasma and eruptive, tuberous, tendon, palmar and plane xanthomas, each with its own location and link to blood fats.

Are Xanthomatous Lesions Dangerous?

The lesions themselves are generally harmless, but eruptive, tendon and some other types can signal blood fat disorders that raise the risk of pancreatitis or heart disease.

Does A Xanthomatous Lesion Mean High Cholesterol?

Often, but not always. Eruptive, tendon, tuberous and palmar types usually come with abnormal blood fats, while about half of people with eyelid xanthelasma have normal results.

Is Xanthelasma A Xanthomatous Condition?

Read moreAchilles Tendon Xanthoma

Yes. Xanthelasma palpebrarum, yellow plaques on the eyelids, is the most common xanthomatous condition.

How Are Xanthomatous Lesions Managed?

By managing the cause, mainly controlling blood fats with lifestyle changes and medicine. Some lesions shrink; eyelid plaques are usually removed with clinic methods or an at-home cream.

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