What it takes to diagnose the disease
Diagnosing iMCD
iMCD can mimic the characteristics of malignant, infectious, and autoimmune disorders1
iMCD’s clinical heterogeneity, as well as its overlap with other disorders and lack of specific biomarkers, can make it challenging to diagnose and manage patients with iMCD. People experiencing lymphadenopathy with no alternative diagnosis should be evaluated for iMCD with an excisional biopsy.
Guidelines that can help diagnose iMCD
The Castleman Disease Collaborative Network (CDCN) convened a working group of 34 international experts that established the first evidence-based consensus treatment guidelines for iMCD, based on a review of 244 cases and 88 tissue samples. Below are some highlights from the CDCN guidelines that can help achieve an accurate diagnosis.1
Major Criteria
(need both)
Histology consistent with Castelman disease (CD)
≥2 enlarged lymph node groups
Minor Criteria (need ≥2, with ≥1 laboratory criterion)
Clinical abnormality
- Constitutional symptoms
- Large spleen and/or liver
- Fluid accumulation
- Violaceous papules
- Lymphocytic Interstitial pneumonitis
Laboratory abnormality
- Elevated CRP
- Anemia
- Thrombocytopenia
- Hypergammaglobulinemia
- Hypoalbuminemia
- Renal dysfunction
Exclusion Criteria
Exclude diseases that iMCD can mimic, such as autoimmune, malignant and infectious diseases.
In order to diagnose a patient with iMCD, you must ensure they meet both Major Criteria and at least 2 of the 11 Minor Criteria, including ≥1 laboratory abnormality, and rule out diseases in the Exclusion Criteria1
You can download a detailed, print-ready version of the CDCN Diagnostic Criteria, which includes a checklist that can help you during the diagnostic process.
Identification of key laboratory and clinical parameters and the inclusion of an excisional biopsy are ideal for the differential diagnosis of iMCD.1,2
Key workup to facilitate the differential diagnosis of iMCD
Clinical Examination
Clinical examination should evaluate the presence of constitutional symptoms, enlarged liver or spleen, fluid accumulation, and skin lesions.1
Laboratory Workup
Laboratory workup should include blood tests to evaluate the following1:
- CRP
- Erythrocyte sedimentation rate (ESR)
- Hemoglobin
- Platelets
- Albumin
- Creatinine
- Total proteins
- Total gamma globulin
- Immunoglobulin G (IgG)
Imaging Tests
Imaging tests should be performed to confirm the presence of multiple groups of enlarged lymph nodes throughout the body.1
Additionally, tests must be performed to exclude diseases that can mimic iMCD, HHV-8, or human immunodeficiency virus (HIV) infection.1
Excisional biopsy ensures pathologic confirmation of iMCD
Fine-needle aspiration or core biopsy is unlikely to capture the affected tissue within the lymph node and may be inadequate to get an accurate diagnosis of iMCD.2-4
An excisional biopsy enables a pathologist to conduct the complete examination of the total lymph node architecture.2,5
Collaborate with a pathologist to confirm a diagnosis of iMCD.1
Jadee L. Neff, MD, PhDIf you have a patient who has unexplained lymphadenopathy, unexplained constitutional symptoms, and they can’t seem to get to a diagnosis, I would recommend an excisional biopsy [to] get a complete look at the lymph node.
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Fajgenbaum DC, Uldrick TS, Bagg A, et al. International, evidence-based consensus diagnostic criteria for HHV-8–negative/idiopathic multicentric Castleman disease. Blood. 2017;129(12):1646-1657.
Allin D, David S, Jacob A, Mir N, Giles A, Gibbins N. Use of core biopsy in diagnosing cervical lymphadenopathy: a viable alternative to surgical excisional biopsy of lymph nodes? Ann R Coll Surg Engl. 2017;99(3):242-244.
Gaurin GE, da Costa Dourado CM. Castleman disease. Medscape. https://emedicine.medscape.com/article/2219018-overview. Updated November 24, 2021. Accessed April 21, 2022.
Early detection, diagnosis, and staging of Castleman disease. American Cancer Society. https://www.cancer.org/content/dam/CRC/PDF/Public/8596.00.pdf. Revised February 8, 2018. Accessed May 11, 2022.
van Rhee F, Voorhees P, Dispenzieri A, et al. International, evidence-based consensus treatment guidelines for idiopathic multicentric Castleman disease. Blood. 2018;132(20):2115-2124.
Mahmud SA, Binstadt BA. Autoantibodies in the pathogenesis, diagnosis, and prognosis of juvenile idiopathic arthritis. Front Immunol. 2019;9:3168.
Autoimmune condition. National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/autoimmune-condition. Accessed June 9, 2022.
Shanbhag S, Ambinder RF. Hodgkin lymphoma: a review and update on recent progress. CA Cancer J Clin. 2018;68(2):116-132.
Cheson BD, Fisher RI, Barrington SF, et al. Recommendations for initial evaluation, staging, and response assessment of Hodgkin and non-Hodgkin lymphoma: the Lugano classification. J Clin Oncol. 2014;32(27):3059-3067.
Fugl A, Andersen CL. Epstein-Barr virus and its association with disease - a review of relevance to general practice. BMC Fam Pract. 2019;20(1):62.
Mononucleosis: symptoms and causes. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/mononucleosis/symptoms-causes/syc-20350328. Published December 22, 2020. Accessed June 9, 2022.
HIV/AIDS: symptoms and causes. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/hiv-aids/symptoms-causes/syc-20373524. Published February 13, 2020. Accessed June 9, 2022.
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Your report
A diagnosis of idiopathic multicentric Castleman disease (iMCD) requires the presence of multiple swollen or enlarged lymph nodes. In some patients, the swollen lymph nodes may not be visible and may require imaging tests to confirm their presence. These symptoms alone are not enough to diagnose iMCD, as they could be signs of other diseases.
Talk to your doctor if you have any questions about this report.
Additional information about iMCD is available for healthcare professionals at KnowiMCD.com/HCP.
To protect your privacy, KnowiMCD.com does not save any of your information. Please be sure to download, save, and/or print this report.
Healthcare professionals can find information about the latest diagnostic criteria and treatment options by visiting
Your report
A diagnosis of idiopathic multicentric Castleman disease (iMCD) requires the presence of multiple swollen or enlarged lymph nodes. In some patients, the swollen lymph nodes may not be visible and may require imaging tests to confirm their presence. These symptoms alone are not enough to diagnose iMCD, as they could be signs of other diseases.
Talk to your doctor if you have any questions about this report.
Additional information about iMCD is available for healthcare professionals at KnowiMCD.com/HCP.
To protect your privacy, KnowiMCD.com does not save any of your information. Please be sure to download, save, and/or print this report.
Possible tests
In order to confirm a diagnosis of iMCD, a doctor will need to perform tests to detect the presence of multiple swollen lymph nodes.
- Physical examination
- Lab tests—blood or urine test
- Imaging tests—CT scan, x-ray, MRI, PET scan
- Excisional biopsy
By performing some of the above-mentioned tests, a doctor will be able to eliminate the possibility of autoimmune, cancerous, and infectious diseases. An excisional biopsy of the enlarged lymph node can confirm the diagnosis of iMCD.
The road to diagnosis
iMCD is a rare disease that can be difficult to diagnose because it can mimic so many other diseases. It may take a while to receive an accurate diagnosis because your doctor must rule out several different conditions before suspecting iMCD.
You may start your diagnosis journey at your primary care physician’s office, where you may be referred to a specialist.
Preparing for your appointment
Here are some tips to help you have a conversation with your doctor:
- Write down any symptoms you’ve experienced, even if they may seem unrelated
- Share the results of this Symptom Checker with your doctor
By performing some of the above-mentioned tests, a doctor will be able to eliminate the possibility of autoimmune, cancerous, and infectious diseases. An excisional biopsy of the enlarged lymph node can confirm the diagnosis of iMCD.
Start the conversation
Here are some tips to help you talk to your doctor about iMCD:
- What kinds of tests might I need to confirm iMCD?
- Do I need to plan for follow-up visits?
- What treatments are available for iMCD? How will they affect my life?
- Do you have any educational materials that I can take with me?
- What else do I need to know about iMCD?
Notes:
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Healthcare professionals can find information about the latest diagnostic criteria and treatment options by visiting
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Viral hemophagocytic lymphohistiocytosis.
A doctor who specializes in the branch of medicine that deals with rheumatic conditions.
Polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy, and skin changes.
Positron emission tomography (PET) is a method of producing a 3-dimensional image of the internal structures of body tissues after administering a natural biochemical substance like glucose or fatty acids. These images are generated with the help of a computer.
A doctor who evaluates the changes caused by disease in tissues and body fluids and helps reach a diagnosis.
A doctor who specializes in the diagnosis and treatment of kidney abnormalities.
Macrophage activation syndrome.
Malignancy-associated hemophagocytic lymphohistiocytosis.
A disease in which cells of the lymph system grow excessively
Lymph nodes make immune cells that help the body fight infection.
A key signaling molecule that helps to regulate the body’s immune system.
Infectious disease medicine is the subspecialty of internal medicine that focuses on diagnosing and managing infections.
A rare condition that affects multiple groups of lymph nodes throughout the body. Patients with iMCD are HIV negative and HHV-8 negative.
The underlying cause or origin of a disease is unknown.
Hemophagocytic lymphohistiocytosis.
Human immunodeficiency virus.
Human herpesvirus-8.
A doctor who specializes in the branch of medical science that deals with cancers of the blood and blood-forming tissues.
Powerful molecules that are normally secreted by the cells of the immune system in response to infectious or noninfectious agents.
An overreaction of the body’s immune system in which too many cytokines are released into the bloodstream very quickly, with potentially severe or life-threatening effects.
Computed tomography (CT) is a method of producing an image of the internal structures by passing an x‑ray through the body.
The removal and examination of tissue, cells, or fluids from the body.
A condition in which the body’s immune system accidentally attacks itself.
Autoimmune lymphoproliferative syndrome.
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