Histiocytosis is a general name for a group of disorders or "syndromes" that involve an abnormal increase in the number of immune cells that are called histiocytes.
There are three major classes of histiocytosis:
- Langerhans cell histiocytosis, which is also called histiocytosis X
- Malignant histiocytosis syndrome (now known as T-cell lymphoma)
- Non-Langerhans cell histiocytosis (also known as hemophagocytic syndrome)
This article focuses only on Langerhans cell histiocytosis (histiocytosis X).
Histiocytosis X; Langerhans cell histiocytosis; Eosinophilic granuloma; Pulmonary histiocytosis X; Nonlipid reticuloendotheliosis; Pulmonary Langerhans cell granulomatosis; Hand-Schuller-Christian disease; Letterer-Siwe disease
Histiocytosis X has typically been thought of as a cancer-like condition. But more recently, researchers have begun to think it may be an autoimmune disorder. In this type of disorder, a person's immune cells mistakenly attack the body, rather than help the body fight infections. The extra immune cells the body makes may form tumors, which can affect various parts of the body, including the bones, skull, and other areas.
Some forms of the disorder are genetic, which means they are inherited.
Histiocytosis X is thought to affect roughly 1 in 200,000 people each year. It is most often seen in children ages 1 - 15, with the highest rate among children ages 5 - 10.
Pulmonary histiocytosis X is a specific type of histiocytosis X that involves swelling of the small airways and small blood vessels in the lungs. This inflammation leads to lung stiffening and damage. It is most common in 30 - 40 year old adults, usually cigarette smokers. The cause is unknown.
Histiocytosis X often affects the whole body. A disease that affects the whole body is called a “systemic” disorder.
Symptoms can vary between children and adults, but they may have some of the same symptoms. Tumors in weight-bearing bones, such as the legs or spine, may cause the bones to fracture without an obvious reason.
Symptoms in children may include:
- Abdominal pain
- Bone pain (possibly)
- Delayed puberty
- Ear drainage that continues long-term
- Eyes that appear to stick out more and more
- Failure to thrive
- Frequent urination
- Mental decline
- Seborrheic dermatitis of the scalp
- Short stature
- Swollen lymph glands
- Weight loss
Note: Children over 5 years old often have only bone involvement.
Symptoms in adults may include:
Exams and Tests
The tumors produce a "punched-out" look on a bone x-ray. Specific tests vary depending on the age of the patient.
Tests in children may include:
Tests in adults may include:
Histiocytosis X is sometimes linked to cancer. CT scans and biopsy should be done to rule out possible cancer.
This disorder is treated with corticosteroids, which suppress immune function (including the dangerous cells). Smoking may worsen the response to treatment and should be stopped.
Children may be given other medications depending on their outlook (prognosis). Such medications may include:
Radiation therapy or surgery may also be used to treat bone lesions.
Other treatments may include:
- Antibiotics to fight infections
- Breathing support (with a breathing machine)
- Hormone replacement therapy
- Physical therapy
- Special shampoos for scalp problems
- Supportive care (also called comfort care) to relieve symptoms
Histiocytosis Association -- www.histio.org
Histiocytosis X affects many organs and can lead to death.
About half of those with pulmonary histiocytosis improve, while others have permanent loss of lung function over time.
In very young patients, the outlook depends on the specific histiocytosis and how severe it is. Some children can live a normal life with minimal disease involvement, while others do poorly. Young children, especially infants, are more likely to have body-wide symptoms that lead to death.
Complications may include:
Children may also develop:
- Anemia caused by spreading of the tumors to the bone marrow
- Diabetes insipidus (a rare form of diabetes)
- Lung problems that lead to lung failure
- Problems with the pituitary gland that lead to growth failure
When to Contact a Medical Professional
Call your health care provider if you or your child have symptoms of this disorder. Go to the emergency room if shortness of breath or chest pain develop.
Avoid smoking. Quitting smoking can improve the outcome in people with histiocytosis X that affects the lungs.
There is no known prevention for the childhood forms of this disease.
Ladisch S. Histiocytosis syndromes of childhood. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 501.
Raghu G. Interstitial lung disease. In: Goldman L, Ausiello D, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 92.
Jordan BM, Filipovich AH. Histiocytic Disorders. In: Hoffman R, Benz EJ, Silberstein, LE, et al, eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, PA: Elsevier Churchill Livingstone; 2012:chap 50.
Reviewed By:Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists & Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency
or for the diagnosis or treatment of any medical condition. A licensed medical professional
should be consulted for diagnosis and treatment of any and all medical conditions. Call 911
for all medical emergencies. Links to other sites are provided for information only -- they
do not constitute endorsements of those other sites. © 1997-A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
The Agency for Health Care Administration (Agency) and this website do not claim the information on, or referred to by, this site is error free. This site may include links to websites of other government agencies or private groups. Our Agency and this website do not control such sites and are not responsible for their content. Reference to or links to any other group, product, service, or information does not mean our Agency or this website approves of that group, product, service, or information.
Additionally, while health information provided through this website may be a valuable resource for the public, it is not designed to offer medical advice. Talk with your doctor about medical care questions you may have.