Langerhans cell histiocytosis is a group of rare disorders that overproduce and accumulate certain types of white blood cells (histiocytes) in organs and tissues in the body.
Histiocyte cells are part of the body’s immune system. In normal numbers, they help fight infection. When the body produces too many histiocyte cells, they actually attack the body’s healthy systems causing bone lesions to all-over body disease.
Langerhans cell histiocytosis is rare. Only 1,200 cases are reported annually. It usually affects children under 12 years old and is more common among whites than blacks.
Specific types of Langerhans cell histiocytosis have different manifestations, presenting with different symptoms and widely different outcomes.
The three syndromes that make up Langerhans cell histiocytosis are:
Single tumors (localized eosinophilic granuloma) occur most frequently in children aged 5-15 years. Males are twice as likely as females to have eosinophilic granuloma. The condition usually manifests in the thoracic section of the spine, which is middle or chest area of the body.
Letterer-Siwe disease is a rare, usually fatal condition that generally affects children age 3 or younger. It is characterized by skin lesions; enlarged liver, spleen and lymph nodes; anemia and bleeding tendencies.
Hand-Schüller-Christian disease, a chronic form of Langerhans cell histiocytosis, is typically diagnosed before age 5. Hand-Schüller-Christian disease is often accompanied by diabetes insipidus, a condition in which the kidneys are unable to maintain water and causes frequent urination.
The cause of Langerhans cell histiocytosis is unknown. It is not inherited or communicable. It can’t be passed from person-to-person like the flu or HIV. Langerhans cell histiocytosis may simply be an abnormality in a person's immune system.
Doctors at The Children’s Hospital of Philadelphia (CHOP) have participated in several research projects on this condition, looking into its causes and treatment outcomes.
Langerhans cell histiocytosis often causes no symptoms in children. Depending on the type of histiocytosis, symptoms may include:
Diagnosing Langerhans cell histiocytosis requires a careful and complete medical workup and examination of your child. Symptoms of Langerhans cell histiocytosis can be similar to other conditions, such as aneurysmal bone cysts, fibrous dysplasia, osteosarcoma, Ewing's sarcoma and others.
Because of this, clinicians at CHOP use a variety of diagnostic tests to correctly identify Langerhans cell histiocytosis.
Diagnostic testing may include:
Treatment for Langerhans cell histiocytosis depends on how many organ systems are affected in your child.
If there are no neurological problems as a result of the tumor, your child’s physician may recommend “watchful waiting” — regular monitoring. Some cases of Langerhans cell histiocytosis resolve on their own.
In more severe cases of Langerhans cell histiocytosis, active treatment may be recommended.
Surgically removing the tumor is generally the recommended treatment for solitary bone lesions (eosinophilic granuloma).
Though surgery is highly effective, we understand that any surgery can be a stressful experience for children and families. At CHOP, we offer a wealth of resources about how to prepare your child for surgery and what to expect during surgery.
Additionally, we employ numerous best practices before, during and after surgery to decrease the risk of infection and increase positive outcomes. Safety in surgery is a top priority.
Radiation therapy may be used alone to treat Langerhans cell histiocytosis, or in conjunction with surgery to shrink or destroy the tumor.
Low-dose chemotherapy is often required when Langerhans cell histiocytosis is more widespread throughout a child’s body and is affecting multiple organs.
If Langerhans cell histiocytosis has affected your child’s spine, additional treatment may be recommended including:
At The Children's Hospital of Philadelphia, we offer ongoing support and services for patients and families at our Main Campus and throughout our CHOP Care Network. Our team is committed to partnering with parents and referring physicians to provide the most current, comprehensive and specialized care possible for your child.
One third to one half of all patients with a form of Langerhans cell histiocytosis will experience some complications ranging from physical disabilities to neuropsychological defects.
Langerhans cell histiocytosis can affect different areas of the body depending on the condition, so your child may need to follow up with a variety of clinical specialists in addition to an orthopedic surgeon. Annual monitoring by experienced medical staff is strongly encouraged.
In rare cases, patients with Langerhans cell histiocytosis can later get secondary malignancies, such as leukemia or solid tumors.
Most children do well after a diagnosis of Langerhans cell histiocytosis. While some lesions resolve on their own, many will require some form of treatment.
Patients with unifocal disease generally have an excellent prognosis. Those with multifocal Langerhans cell histiocytosis fare almost as well; while patients with disseminated disease — such as those with Letterer-Siwe disease — face the most challenges.
To make an appointment with the Division of Orthopedic Surgery at The Children's Hospital of Philadelphia, call 215-590-1527 or contact us online.
Reviewed by: Jason L. Katz, PA-C, MHS, ATC-R, and John P. Dormans, MD, FACS
Date: January 2013