Macrophage activation syndrome (MAS) is a potentially life-threatening complication of rheumatic disorders that occurs most commonly in systemic juvenile idiopathic arthritis. In recent years, there have been several advances in…
Hemophagocytic lymphohistiocytosis (HLH) is a rare but potentially fatal syndrome of pathologic immune dysregulation characterized by clinical signs and symptoms of extreme inflammation. HLH can occur as a genetic or…
Hemophagocytic Lymphohistiocytosis (HLH), an inherited life-threatening inflammatory disorder, has gained growing recognition not only in children but also increasingly in adults over the past 2 decades. HLH involves inborn defects…
Familial hemophagocytic lymphohistiocytosis (FHL) is a rare heritable disorder of immune regulation that is typically characterized by sudden onset of severe systemic illness. Functional impairment or absence of 1 or…
Diseases of the central nervous system (CNS) are common in patients with Langerhans cell histiocytosis (LCH). Besides active LCH lesions, neurodegenerative (ND) lesions of the cerebellum and/or basal ganglia may…
Langerhans cell histiocytosis (LCH) is a disease caused by clonal proliferation of CD1a+/CD207+ cells that is characterized by a spectrum of varying degrees of organ involvement and dysfunction. Treatment of LCH…
The discovery of recurrent somatic genomic alterations in Langerhans cell histiocytosis (LCH) has led to a new understanding of LCH as a clonal neoplastic disorder. Most of the abnormalities described…
Langerhans cell histiocytosis (LCH) is heterogeneous disease characterized by common histology of inflammatory lesions containing Langerin + (CD207) histiocytes. Emerging data support a model in which MAPK activation in self-renewing…
The classification of the histiocytoses has evolved based on new understanding of the cell of origin as a bone marrow precursor. Although the pathologic features of the histiocytoses have not…
Nancy Berliner, MD, Editor Barrett J. Rollins, MD, PhD, Editor Histiocytes are bone marrow–derived cells that protect the body from foreign substances by phagocytosing them and, in some cases, using…
