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Before the Histiocyte Society classified histiocytoses in the 1980s, the condition was also known as "Histiocytosis X", where "X" denoted the then unknown cause. [9] [10] [11] It is now known as chronic multifocal Langerhans cell histiocytosis, a subtype of LCH. [3] The disease is rare. [12] Most present between the ages of two and six. [2]
CT scan showing LCH infiltrating peri-orbital tissue (arrowed). A patient with Hand–Schüller–Christian disease which is a subtype of Langerhans Cell Histiocytosis. LCH provokes a non-specific inflammatory response, which includes fever, lethargy, and weight loss. Organ involvement can also cause more specific symptoms.
The Histiocyte Society, a nonprofit organization, is a group of more than 200 physicians and scientists from around the world committed to improving the lives of patients with histiocytic disorders by conducting clinical and laboratory research into the causes and treatment of this disease. The Society has instituted several clinical trials and ...
Initial reports questioned whether this was a true medical disorder, or whether the inflammation was secondary to another condition, such as gastroesophageal reflux disease. The cause of lymphocytic esophagitis is unknown. The disease may cause different symptoms and be caused by different processes in childhood as compared to adulthood.
Schilder disease or diffuse myelinoclastic sclerosis: is a rare disease that presents clinically as a pseudotumoural demyelinating lesion; and is more common in children. [56] [57] Solitary sclerosis: This variant was proposed (2012) by Mayo Clinic researchers. [58] though it was also reported by other groups more or less at the same time.
X-linked lymphoproliferative disease; Other names: Duncan disease, Purtilo syndrome: Specialty: Hematology : Symptoms: Reduced resistance to the Epstein-Barr virus (EBV), leading to infectious mononucleosis, hemophagocytic lymphohistiocytosis (HLH), dysgammaglobulinemia, non-Hodgkin lymphoma, aplastic anemia, vasculitis, chronic gastritis, skin lesions
The symptoms that showed up in younger children were less likely to overlap with symptoms experienced by adults with long COVID. The authors said this underscored the importance of age-based research.
AL amyloidosis is caused by the deposition of abnormal antibody free light chains. The abnormal light chains are produced by monoclonal plasma cells, and, although AL amyloidosis can occur without diagnosis of another disorder, it is often associated with other plasma cell disorders, such as multiple myeloma and Waldenström's macroglobulinemia. [6]