Term Name:	Langerhans-cell histiocytosis
Synonyms:	Histiocytosis X, Langerhan's cell histiocytosis, Langerhans cell granulomatosis, Letterer-Siwe disease, Letterer-Siwe disease involving intra-abdominal lymph nodes, Letterer-Siwe disease involving intrapelvic lymph nodes, Letterer-Siwe disease involving intrathoracic lymph nodes, Letterer-Siwe disease involving lymph nodes of axilla and upper limb, Letterer-Siwe disease involving lymph nodes of head, face and neck, Letterer-Siwe disease involving lymph nodes of head, face, and neck, Letterer-Siwe disease involving lymph nodes of inguinal region and lower limb, Letterer-Siwe disease involving lymph nodes of multiple sites, Letterer-Siwe disease involving spleen, Letterer-Siwe disease of intra-abdominal lymph nodes, Letterer-Siwe disease of intrapelvic lymph nodes, Letterer-Siwe disease of intrathoracic lymph nodes, Letterer-Siwe disease of lymph nodes of axilla and upper limb, Letterer-Siwe disease of lymph nodes of axilla and/or upper limb, Letterer-Siwe disease of lymph nodes of head, face and neck, Letterer-Siwe disease of lymph nodes of head, face and/or neck, Letterer-Siwe disease of lymph nodes of inguinal region amd/or lower limb, Letterer-Siwe disease of lymph nodes of inguinal region and lower limb, Letterer-Siwe disease of lymph nodes of inguinal region and/or lower limb, Letterer-Siwe disease of lymph nodes of multiple sites, Letterer-Siwe disease of spleen
Definition:	A histiocytosis that is characterized by clonal proliferation of Langerhans cells.
Ontology:	Human Disease [DOID:2571]   ( DOID:2571 )