Castleman Disease: Diagnosis, Outlook, and Modern Treatment Approaches

Castleman disease is a rare disorder in which lymph node tissue grows abnormally, causing enlarged lymph nodes and, in some cases, body-wide inflammation. Diagnosis usually relies on imaging, blood tests, and lymph node biopsy, while treatment depends on whether the disease affects one lymph node region or multiple areas.

Overview: what Castleman disease is

Castleman disease is a rare condition that causes an overgrowth of cells in lymph node tissue. It can make one lymph node or a group of lymph nodes become enlarged, and in some people it also triggers inflammation throughout the body. Although it can resemble cancer, infection, or autoimmune disease, Castleman disease is a distinct disorder with its own patterns of diagnosis and treatment.

Doctors usually divide Castleman disease into two main types: unicentric Castleman disease (UCD), which affects a single lymph node region, and multicentric Castleman disease (MCD), which affects more than one area and often causes general symptoms. This distinction matters because the outlook, treatment plan, and need for long-term monitoring are different for each type.

Castleman disease may be discovered after a person notices a lump, develops symptoms such as fatigue or fever, or has imaging done for another reason. Because the condition is uncommon and its signs can overlap with other illnesses, careful evaluation is important. In some cases, doctors also assess for related problems such as immune system changes, viral infection, or disorders of the blood and lymphatic system.

Symptoms and how the condition may present

The symptoms of Castleman disease depend mainly on whether it is unicentric or multicentric. Unicentric Castleman disease may cause no symptoms at all and can be found incidentally on a scan or during an examination. When symptoms do occur, they are often related to pressure from an enlarged lymph node, such as a lump in the neck, chest, abdomen, or underarm, discomfort, fullness, or swelling nearby.

Multicentric Castleman disease is more likely to cause general or body-wide symptoms. These can include fever, night sweats, tiredness, unintentional weight loss, loss of appetite, weakness, or swelling in different parts of the body. Some people also develop fluid retention, enlarged liver or spleen, numbness, skin changes, or shortness of breath depending on the extent of inflammation.

Possible symptoms and signs may include:

• Enlarged lymph nodes
• Fatigue and reduced energy
• Fever or night sweats
• Unexplained weight loss
• Abdominal fullness or discomfort
• Swelling of the legs or fluid buildup
• Low blood counts or abnormal blood test results

These symptoms are not specific to Castleman disease. Similar features can occur in infections, autoimmune conditions, and cancers such as lymphoma. That is why a structured diagnostic workup is needed rather than relying on symptoms alone.

Types, causes, and risk factors

Castleman disease is described by both location and underlying biology. Unicentric Castleman disease involves one lymph node area and is often localized. Multicentric Castleman disease affects multiple lymph node regions and is associated with systemic inflammation. Within multicentric disease, doctors may identify subtypes, including HHV-8-associated disease and idiopathic multicentric Castleman disease, when no clear cause is found.

The exact cause is not always known. In some patients, abnormal immune signaling appears to play a central role, especially involving inflammatory proteins such as interleukin-6. In HHV-8-associated multicentric Castleman disease, a viral infection contributes to the disease process. Some people with immune suppression, including those with HIV, may be at higher risk of this form.

Castleman disease is not generally considered an inherited disorder, and most cases do not run in families. There is no clear evidence that common lifestyle habits directly cause it. The main risk-related factors are linked to immune function, viral association in certain cases, and the presence of inflammatory abnormalities detected during medical evaluation.

Because the disease can overlap with other conditions, doctors may also assess for related disorders that affect lymph nodes, blood cells, or inflammation. This may include ruling out leukemia and other diseases that can produce similar laboratory or imaging findings.

How Castleman disease is diagnosed

Diagnosis begins with a detailed medical history, physical examination, and review of symptoms. Doctors ask about the timing of enlarged lymph nodes, fever, weight changes, recurrent infections, autoimmune symptoms, and prior immune-related conditions. They also examine for enlarged liver or spleen and look for swelling, skin changes, or other clues to body-wide inflammation.

Blood tests are commonly used to look for inflammation, anemia, changes in kidney or liver function, low albumin, and abnormal immune markers. Additional testing may include viral studies, especially for HIV and HHV-8 when multicentric disease is suspected. Imaging, such as MRI or CT scans, helps show where enlarged lymph nodes are located and whether the disease appears limited to one region or involves several areas.

A lymph node biopsy is usually the key step in confirming Castleman disease. Pathologists examine the tissue under a microscope to identify characteristic changes and to exclude other causes such as lymphoma, infection, or metastatic cancer. In many cases, excisional biopsy, where all or part of the lymph node is removed, provides more information than a needle sample.

For some patients, additional tests are needed to understand the full picture and guide treatment. These may include bone marrow studies, specialized pathology review, or evaluation by hematology, oncology, infectious disease, and radiology specialists. A multidisciplinary approach is especially helpful when the presentation is complex or when the disease resembles another serious condition.

Modern treatment approaches

Treatment depends first on whether the disease is unicentric or multicentric. For unicentric Castleman disease, surgery to remove the affected lymph node is often the preferred treatment when it is technically safe. If complete removal is possible, symptoms and abnormal laboratory findings often improve. In selected situations, robotic surgery or other minimally invasive techniques may be considered depending on the node’s location and the surgeon’s assessment.

When unicentric disease cannot be removed fully because of its location, doctors may consider other approaches such as careful monitoring, medicines to reduce inflammation, or radiation therapy in selected cases. The exact choice depends on symptoms, nearby organs, and whether the enlarged node is causing pressure effects.

Multicentric Castleman disease usually needs systemic treatment because more than one area is involved and inflammation may affect the whole body. Depending on the subtype and the patient’s health status, treatment may include targeted therapy against inflammatory pathways, monoclonal antibody therapy, corticosteroids, antiviral treatment in HHV-8-associated disease, and sometimes chemotherapy. The goal is to control inflammation, relieve symptoms, improve blood test abnormalities, and protect organ function.

Some patients need supportive care in addition to disease-specific treatment. This can include management of anemia, infections, fluid retention, nutritional issues, or kidney problems. If there is concern for overlap with other blood or lymphatic conditions, a hematology team may also evaluate whether bone marrow transplantation has any role in very selected, complicated cases, though it is not a routine treatment for most patients with Castleman disease.

Outlook, follow-up, and living with the condition

The outlook for Castleman disease varies widely by type. Unicentric Castleman disease often has a favorable outlook when the affected lymph node can be removed completely. Many patients do well after treatment, although follow-up is still important to confirm that symptoms and imaging findings remain stable.

Multicentric Castleman disease has a more variable course and usually requires ongoing medical care. Some people respond well to treatment and achieve good symptom control, while others may need long-term monitoring and adjustments in therapy over time. The outcome depends on factors such as subtype, severity of inflammation, associated infections, and whether major organs are affected.

Regular follow-up may include physical examinations, blood tests, and repeat imaging when needed. Monitoring helps doctors track symptoms, assess treatment response, and identify relapse or complications early. Patients are often encouraged to keep a record of fatigue, fevers, swelling, weight change, and new symptoms to support discussions at follow-up visits.

Living with a rare condition can be stressful, especially when diagnosis takes time. Clear communication with the care team, learning the disease subtype, and understanding the goals of treatment can help patients feel more informed and prepared. Near the end of the care pathway, some international patients may choose evaluation at centers such as Acibadem International, where multidisciplinary specialists in JCI-accredited hospitals diagnose and treat complex blood and lymphatic conditions.

Prevention, self-care, and when to seek medical care

There is no proven way to prevent Castleman disease because the exact cause is often unclear. Even so, general health measures remain important, especially for people receiving immune-modifying treatment. Staying up to date with recommended medical follow-up, reporting new symptoms promptly, supporting good nutrition, and discussing infection prevention with a doctor can all be helpful.

Self-care does not replace medical treatment, but it can support overall wellbeing. Patients may benefit from balancing activity with rest, maintaining hydration, and seeking help for fatigue, appetite changes, or emotional stress. Because some symptoms overlap with side effects of treatment or signs of other illnesses, new concerns should not be self-diagnosed.

Medical care should be sought if there is a persistent enlarged lymph node, unexplained fever, drenching night sweats, ongoing fatigue, unintentional weight loss, or swelling that does not improve. Urgent assessment is important if a person develops shortness of breath, marked weakness, severe swelling, signs of infection, or rapid worsening of symptoms.

People who have already been diagnosed should contact their doctor if symptoms return, blood test results worsen, or treatment side effects become difficult to manage. Early review can help clarify whether the problem is disease activity, infection, medication effects, or another condition that needs attention.

Frequently asked questions

Is Castleman disease cancer?

Castleman disease is not usually classified as cancer, but it can behave like a serious lymph node disorder and may resemble cancer in symptoms or imaging. Because it can look similar to lymphoma or infection, a biopsy is often needed to confirm the diagnosis.

What is the difference between unicentric and multicentric Castleman disease?

Unicentric Castleman disease affects one lymph node region and is often treated with surgery. Multicentric Castleman disease affects multiple areas and usually causes body-wide inflammation, so it often requires medicines that treat the whole body rather than a single procedure.

Can Castleman disease be cured?

Some people with unicentric Castleman disease can be effectively treated when the affected lymph node is fully removed. Multicentric Castleman disease is often managed rather than cured, with treatment focused on controlling inflammation, symptoms, and complications.

What tests are needed to diagnose Castleman disease?

Doctors usually use a combination of physical examination, blood tests, imaging studies, and a lymph node biopsy. The biopsy is especially important because it helps distinguish Castleman disease from lymphoma, infection, and other causes of enlarged lymph nodes.

Is Castleman disease hereditary?

Most cases are not thought to be inherited, and Castleman disease usually does not run in families. Current understanding suggests that immune dysregulation and, in some cases, viral association are more important than genetics alone.

What symptoms should prompt a doctor visit?

A person should arrange medical review for a persistent enlarged lymph node, unexplained fever, night sweats, unusual fatigue, or unintentional weight loss. Prompt care is also important for breathing difficulty, worsening swelling, or signs of infection.

References

• National Cancer Institute
• National Organization for Rare Disorders
• American Cancer Society
• National Institutes of Health
• Castleman Disease Collaborative Network

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.