eMedicine Specialties > Pediatrics: General Medicine > Oncology
Lymphohistiocytosis (Hemophagocytic Lymphohistiocytosis): Follow-up
Updated: Aug 21, 2009
Follow-up
Further Outpatient Care
- Supportive care is needed to ensure that the patient with hemophagocytic lymphohistiocytosis (HLH) remains stable until a bone marrow donor can be found. This includes transfusions of RBCs, platelets, and fresh frozen plasma, as well as nutritional support in addition to the treatment protocol.22
- Patients should be continually monitored for evidence of infection because of their immunosuppressed state. Be aware of the possibility of underlying malignancy.
- Biopsies and diagnostic cytogenetics may be needed in addition to selective radiographic imaging.12
Complications
- Complications of individual drugs in the regimen were outlined above (see Medication).
- Complications due to a subsequent transplant are numerous and include both acute and chronic graft versus host disease, acute inflammatory events, respiratory distress syndrome, and exacerbation of neurologic symptoms.26
Prognosis
- Although the prognosis varies between studies and with different approaches to treatment, the disease is invariably fatal if not treated. The median survival rate has been reported to be 2-6 months without treatment, but survival time has dramatically improved with the advent of the HLH-94 protocol already discussed.
- A study of 122 patients from the International Registry for hemophagocytic lymphohistiocytosis found that the overall estimated 5-year survival rate was 21%, with 66% of patients who received bone marrow transplantation (BMT) surviving 5 years versus only 10.1% of patients treated with chemotherapy alone.14 More recent studies have shown that the HLH-94 protocol resulted in an overall survival rate of 55%. Success or failure of an allogeneic BMT is the most important long-term prognostic factor. Unfortunately, many cases are diagnosed late in the course of the disease, after irreversible damage has occurred.
- Although patients with hemophagocytic lymphohistiocytosis are at high risk for death early in their disease course, steroids, intravenous immunoglobulin (IVIG), or both may be sufficient as first-line therapy for selected patients.27
Patient Education
- All physicians who treat young patients must be aware of life-threatening diseases such as hemophagocytic lymphohistiocytosis.
- Pediatricians, dermatologists, and neurologists should especially take note because the presenting symptoms of hemophagocytic lymphohistiocytosis are likely to bring the patient into their offices.
- Any suspicion warrants a referral to a pediatric hematologic-oncologist who is equipped with the necessary tools to make a rapid diagnosis.
Miscellaneous
Medicolegal Pitfalls
- Be aware of this disease, both in its typical onset and when it occurs later in life with the initial presentation of CNS symptoms or underlying malignancy rather than the typical triad of a fever, hepatosplenomegaly, and pancytopenia.
- Cases of hemophagocytic lymphohistiocytosis (HLH) erroneously labeled as child abuse have been reported in the literature.28
- Failure to make the diagnosis of hemophagocytic lymphohistiocytosis may result in adverse consequences.
Special Concerns
- Although rare, the disease onset can occur later in life with the initial presentation of CNS symptoms or underlying malignancy rather than the typical triad of a fever, hepatosplenomegaly, and pancytopenia.
- Physicians should be aware of this atypical presentation and consider hemophagocytic lymphohistiocytosis in their differentials.20
The authors and editors of eMedicine gratefully acknowledge the contributions of previous authors Nicole L Lacz, MD, and Franklin Desposito, MD, to the original writing and development of this article.
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References
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Further Reading
Keywords
lymphohistiocytosis, hemophagocytic lymphohistiocytosis, HLH, familial hemophagocytic lymphohistiocytosis, FHL, familial erythrophagocytic lymphohistiocytosis, FEL, primary hemophagocytic lymphohistiocytosis, primary HLH, secondary hemophagocytic lymphohistiocytosis, secondary HLH, acquired hemophagocytic lymphohistiocytosis, acquired HLH, infection-associated hemophagocytic syndrome, IAHS, reactive HLH, hepatosplenomegaly, pancytopenia, lymphadenopathy, ascites, gallbladder wall thickening, treatment, diagnosis
Follow-up: Lymphohistiocytosis (Hemophagocytic Lymphohistiocytosis)