Angiomatoid Fibrous Histiocytoma: A Rare Soft Tissue Tumor That Mostly Affects Children and Teens

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

Angiomatoid fibrous histiocytoma (AFH) is a rare soft tissue tumor that mostly affects children, adolescents, and young adults. It is often noncancerous, appears most frequently on the arms and legs, and can usually be cured with surgery. Spread to other parts of the body happens in less than 1% of cases.

Quick Answer

• What it is: A rare soft tissue tumor that makes up approximately 0.3% of all soft tissue tumors.

• Who gets it: About 88% of people diagnosed with AFH are age 30 or younger, and the average age at diagnosis is 14.

• Is it cancer: It is considered a low-grade tumor. Most cases are noncancerous (benign), though some can be malignant; the chance of spreading is under 1%.

• How it is treated: Surgical removal of the entire tumor plus surrounding healthy tissue is the preferred treatment, and in most cases AFH can be cured with surgery.

What Is Angiomatoid Fibrous Histiocytoma?

Angiomatoid fibrous histiocytoma (AFH) is a rare type of soft tissue tumor. It most commonly develops on the extremities, including the arms, legs, hands, and feet.

The name describes what the tumor looks like under examination. Understanding each part of the name makes the diagnosis easier to interpret.

Word in the Name	What It Means
Angiomatoid	The tumor has a vascular-like, blood-vessel appearance
Fibrous	The mass has a ropey, sinewy nature
Histiocytoma	A tumor containing histiocytes — normal immune cells that have traveled from one area of the body to another

Is Angiomatoid Fibrous Histiocytoma Cancerous?

Angiomatoid fibrous histiocytomas are often benign soft tissue tumors, which means they are noncancerous. In some cases, however, they can be malignant soft tissue tumors, and these may be referred to as soft tissue sarcomas.

Overall, AFH is considered a low-grade malignant tumor. This means there is a low probability that it will spread to other parts of the body.

This classification is genuinely reassuring news for most families. Low-grade tumors grow slowly and behave far less aggressively than high-grade cancers.

How Common Is Angiomatoid Fibrous Histiocytoma?

AFH is rare. It accounts for approximately 0.3% of all soft tissue tumors.

The tumor also has a distinct age and location pattern that sets it apart from other soft tissue masses.

Fact	Detail
Share of soft tissue tumors	Approximately 0.3%
Most affected groups	Children, adolescents, and young adults
Share of patients age 30 or younger	Approximately 88%
Average age at diagnosis	14 years

Where Does Angiomatoid Fibrous Histiocytoma Occur?

Angiomatoid fibrous histiocytomas generally develop in the dermis, the skin layer, of the arms and legs.

In extremely rare cases, AFH can appear in the somatic soft tissues. These unusual locations include the brain, lung, mediastinum (the central chest area containing the heart and thymus gland), and the omentum (the fold of tissue connecting the stomach to other abdominal organs).

Location	Frequency
Dermis of the arms and legs	Most common
Hands	Common
Feet	Common
Brain, lung, mediastinum, omentum	Extremely rare

What Are Angiomatoid Fibrous Histiocytoma Symptoms?

Many people with AFH have no symptoms at all. When warning signs do develop, they usually include systemic symptoms rather than pain at the lump site.

Symptom	How Common
No symptoms at all	Common — many people have none
Fever	Possible warning sign
Anemia	Possible warning sign
Weight loss	Possible warning sign
Pain and tenderness	Extremely rare — only a small percentage of people

This symptom pattern matters for parents. A firm lump on a child's limb that does not hurt may still deserve medical attention, because AFH often presents without pain.

What Causes Angiomatoid Fibrous Histiocytoma?

Histiocytomas develop when histiocytes — normal immune cells found in various parts of the body — grow rapidly and produce more histiocytes.

The exact cause of AFH is unknown. However, the tumor has been linked to three factors.

Linked Factor	Notes
Genetics	Suspected role in tumor development
Inherited conditions	Associated with increased risk
Radiation treatment	Associated with increased risk
Unknown factors	The exact cause has not been identified

Can Angiomatoid Fibrous Histiocytoma Spread?

It is possible, but rare. AFH metastasizes (spreads) to other parts of the body in less than 1% of cases.

This low metastasis rate is why AFH carries an overall favorable outlook compared with most sarcomas. Most tumors remain where they started and never seed distant organs.

How Is Angiomatoid Fibrous Histiocytoma Diagnosed?

Because of how it looks and behaves, AFH is often mistaken for two much more common conditions: hematomas (when blood collects outside the blood vessels) or hemangiomas (bright red birthmarks that form during the first or second week of life).

When a provider suspects AFH, they typically remove all or part of the tumor (a biopsy) and examine it under a microscope.

Diagnostic Step	What Happens
Initial appearance	Often mistaken for a hematoma or hemangioma
Biopsy	All or part of the tumor is removed
Microscopic examination	Tissue is examined under a microscope
Key findings	Solid nests of histiocyte-like cells, cyst-like spaces, and masses of chronic inflammatory cells
Diagnosis	Made when the hallmark features are noted

When the laboratory report describes solid nests of histiocyte-like cells, cyst-like spaces, and masses of chronic inflammatory cells, those are the hallmarks that confirm an AFH diagnosis.

How Is Angiomatoid Fibrous Histiocytoma Treated?

Angiomatoid fibrous histiocytoma treatment usually involves surgical removal of the tumor. The surgeon removes the entire tumor along with some healthy tissue around it, which reduces the risk of recurrence (the tumor returning).

Treatment	When It Is Used
Surgery	Preferred first-line treatment; removes the entire tumor plus surrounding healthy tissue
Chemotherapy	Considered if the tumor is in a challenging location or has spread
Radiation therapy	Considered for hard-to-reach areas such as the head or neck, or if the tumor has spread

If the tumor sits in an area that makes surgical removal challenging, such as the head or neck, or if it has spread to distant areas, chemotherapy or radiation therapy may be recommended.

What Are the Complications of Treatment?

Like any surgical procedure, tumor removal carries the risk of certain side effects, including infection, nerve damage, pain, and bleeding.

People who undergo chemotherapy or radiation therapy may experience a wider range of side effects.

Treatment	Possible Side Effects
Surgery	Infection, nerve damage, pain, bleeding
Chemotherapy or radiation	Anemia, hair loss, fatigue, nausea and vomiting

A provider can explain what to expect from any specific treatment plan before it begins.

What Can I Expect If I Have Angiomatoid Fibrous Histiocytoma?

If you or your child has been diagnosed with AFH, your healthcare provider will discuss your options in detail. The path forward depends primarily on whether the tumor has spread.

Scenario	Likely Path	Outlook
Tumor has not spread	Surgery is likely the suggested treatment	In the majority of cases, there is no recurrence after surgical removal
Tumor has spread	Chemotherapy or radiation therapy	Requires multiple appointments and follow-ups to monitor progress

In most cases, AFH can be cured with surgery. In the rare instances where the disease spreads to other areas of the body, AFH is usually fatal. These two realities define the full outlook: excellent for the large majority, serious for a small minority.

Can I Prevent Angiomatoid Fibrous Histiocytoma?

There is no known way to prevent angiomatoid fibrous histiocytoma. Because the exact cause is unknown and the tumor is strongly associated with genetics, no lifestyle measure or screening program currently reduces risk.

When Should I See a Healthcare Provider?

Anytime you notice sudden changes in the appearance of your skin, schedule a visit with your healthcare provider. They will monitor the area and run any necessary tests.

A new lump on the skin of a child's or teen's arm or leg is worth a prompt evaluation — even when it does not hurt. Early biopsy is the only reliable way to distinguish AFH from harmless conditions like hematomas and hemangiomas.

Questions to Ask Your Doctor

Question	Why It Matters
Where is the tumor located?	Determines whether surgery is straightforward or challenging
What is the size of the tumor?	Affects surgical planning
Is the tumor benign or malignant?	Determines urgency and treatment intensity
Has the tumor spread?	The single most important prognostic question
What are my treatment options?	Surfaces surgery versus chemo/radiation choices
What are the chances surgery will work?	Clarifies expected success for your specific case
Should I consider chemotherapy or radiation therapy?	Relevant for difficult locations or spread
Can you recommend resources so I can learn more?	Opens access to support groups and education

If the AFH is malignant, ask your provider about support groups in your area. Talking with others going through the same thing can benefit your mental, emotional, and spiritual health.

Conclusion

Angiomatoid fibrous histiocytoma is a rare, mostly noncancerous soft tissue tumor that favors the arms and legs of children, teens, and young adults — about 88% of patients are under 30 and the average diagnosis happens at age 14. It rarely causes symptoms, almost never spreads, and is usually cured with a single surgical removal.

If you notice a new lump or sudden skin change — especially on a child's or teenager's limb — have it evaluated by a healthcare provider. A simple biopsy can distinguish AFH from harmless look-alikes and, if needed, get curative treatment started early.

FAQ

What is angiomatoid fibrous histiocytoma?

Angiomatoid fibrous histiocytoma (AFH) is a rare soft tissue tumor that commonly affects the extremities, such as the arms, legs, hands, and feet. It accounts for approximately 0.3% of all soft tissue tumors.

Is angiomatoid fibrous histiocytoma cancer?

AFH is considered a low-grade tumor. Most cases are benign (noncancerous), though some can be malignant and are then classified as soft tissue sarcomas. The probability of spreading is low.

Who gets angiomatoid fibrous histiocytoma?

It most commonly affects children, adolescents, and young adults. Approximately 88% of people diagnosed with AFH are age 30 or younger, and the average age at diagnosis is 14.

What does angiomatoid fibrous histiocytoma feel like?

Many people have no symptoms at all. When warning signs develop, they typically include fever, anemia, and weight loss. Pain and tenderness are extremely rare.

Can angiomatoid fibrous histiocytoma spread?

Spread (metastasis) is possible but rare. AFH metastasizes to other parts of the body in less than 1% of cases.

How is angiomatoid fibrous histiocytoma diagnosed?

It is often initially mistaken for a hematoma or hemangioma. Diagnosis requires a biopsy — removing all or part of the tumor and examining it under a microscope for solid nests of histiocyte-like cells, cyst-like spaces, and chronic inflammatory cells.

How is angiomatoid fibrous histiocytoma treated?

Treatment usually involves surgical removal of the entire tumor plus some surrounding healthy tissue, which reduces recurrence risk. Chemotherapy or radiation may be used when surgery is difficult or the tumor has spread.

Can angiomatoid fibrous histiocytoma be cured?

In most cases, AFH can be cured with surgery. After surgical removal, the majority of cases do not recur.

Related Reading

• Soft Tissue Sarcoma

• Hemangioma

References

• Cleveland Clinic, "Angiomatoid Fibrous Histiocytoma," Diseases & Conditions, accessed August 2026.

• Bauer A, Jackson B, Marner E, Gilbertson-Dahdal D. "Angiomatoid fibrous histiocytoma: a case report and review of the literature." J Radiol Case Rep. 2012;6(11):8-15.

• Bernini JC, Fort DW, Pritchard M, Rogers BB, Winick NJ. "Adjuvant chemotherapy for treatment of unresectable and metastatic angiomatoid malignant fibrous histiocytoma." Cancer. 1994;74(3):962-4.

• Huerter ME, Hammadeh R, Zhou Q, Riker AI. "Recurrent angiomatoid fibrous histiocytoma: a case report and review of the literature." Ochsner J. 2014;14(3):441-4.

• Morgan LM, Miller ER, Raj AB, Coventry SC, Elster JD. "Angiomatoid Fibrous Histiocytoma With Paraneoplastic Platelet Storage Pool Deficiency." Pediatrics. 2018;141(3).

• Saito K, Kobayashi E, Yoshida A, Araki Y, et al. "Angiomatoid fibrous histiocytoma: a series of seven cases including genetically confirmed aggressive cases and a literature review." BMC Musculoskelet Disord. 2017;18:31.

Medical disclaimer: This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions about a medical condition. Never disregard professional medical advice or delay seeking care based on information in this article.