Overview
Systemic non-Langerhans cell histiocytosis refers to a group of rare disorders in which certain immune cells called histiocytes (but not the specific type known as Langerhans cells) build up in various organs and tissues throughout the body. This term is now considered obsolete in medical classification, meaning it has been replaced by more specific disease names as our understanding of these conditions has improved. The conditions that were once grouped under this label include diseases like Erdheim-Chester disease, Rosai-Dorfman disease, and other forms of non-Langerhans cell histiocytosis. In these conditions, abnormal histiocytes can accumulate in the skin, bones, lungs, brain, kidneys, heart, and other organs, causing inflammation and damage. Symptoms vary widely depending on which organs are affected but can include bone pain, skin nodules or rashes, difficulty breathing, vision problems, diabetes insipidus (excessive thirst and urination), and neurological symptoms. Some patients may have mild disease affecting only one area, while others experience widespread organ involvement. Treatment has evolved significantly in recent years. Targeted therapies, particularly drugs that block the BRAF or MEK pathways, have transformed the management of some of these conditions. Chemotherapy, immunotherapy, and supportive care are also used depending on the specific diagnosis and severity. Because this is now an obsolete grouping, patients previously diagnosed under this term should work with their doctors to determine which specific type of histiocytosis they have, as this affects treatment choices and outlook.
Key symptoms:
Bone pain, especially in the long bonesSkin bumps, nodules, or yellowish rashesExcessive thirst and frequent urination (diabetes insipidus)Shortness of breath or difficulty breathingFatigue and general weaknessSwollen lymph nodesVision problems or bulging eyesFever without infectionWeight lossNeurological symptoms such as balance problems or confusionKidney problemsHeart or blood vessel involvementEnlarged liver or spleenJoint pain or stiffness
Sporadic
Usually appears on its own, not inherited from a parent
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for OBSOLETE: Systemic non-Langerhans cell histiocytosis.
View clinical trials →Clinical Trials
View all trials with filters →No actively recruiting trials found for OBSOLETE: Systemic non-Langerhans cell histiocytosis at this time.
New trials open frequently. Follow this disease to get notified.
Specialists
View all specialists →No specialists are currently listed for OBSOLETE: Systemic non-Langerhans cell histiocytosis.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to OBSOLETE: Systemic non-Langerhans cell histiocytosis.
Community
No community posts yet. Be the first to share your experience with OBSOLETE: Systemic non-Langerhans cell histiocytosis.
Start the conversation →Latest news about OBSOLETE: Systemic non-Langerhans cell histiocytosis
No recent news articles for OBSOLETE: Systemic non-Langerhans cell histiocytosis.
Follow this condition to be notified when news becomes available.
Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What specific type of non-Langerhans cell histiocytosis do I have, and what does that mean for my treatment?,Has my biopsy been tested for BRAF and other targetable mutations?,Which organs are affected, and how will you monitor them over time?,What are the treatment options available to me, and what are their side effects?,How long will I need to be on treatment, and what happens if I stop?,Are there any clinical trials I might be eligible for?,Should I be seen at a specialized center with expertise in histiocytic disorders?
Common questions about OBSOLETE: Systemic non-Langerhans cell histiocytosis
What is OBSOLETE: Systemic non-Langerhans cell histiocytosis?
Systemic non-Langerhans cell histiocytosis refers to a group of rare disorders in which certain immune cells called histiocytes (but not the specific type known as Langerhans cells) build up in various organs and tissues throughout the body. This term is now considered obsolete in medical classification, meaning it has been replaced by more specific disease names as our understanding of these conditions has improved. The conditions that were once grouped under this label include diseases like Erdheim-Chester disease, Rosai-Dorfman disease, and other forms of non-Langerhans cell histiocytosis.
How is OBSOLETE: Systemic non-Langerhans cell histiocytosis inherited?
OBSOLETE: Systemic non-Langerhans cell histiocytosis follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.