RT Book, Section A1 Bissonnette, Bruno A1 Luginbuehl, Igor A1 Engelhardt, Thomas SR Print(0) ID 1164076789 T1 Letterer-Siwe Disease (LSD) T2 Syndromes: Rapid Recognition and Perioperative Implications, 2e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259861789 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1164076789 RD 2024/04/19 AB It is a childhood immunologic disorder characterized by pathologic proliferation of histiocytes caused by the Langerhans cells. It is one of the four recognized clinical syndromes of Langerhans cell histiocytosis (LCH). It causes approximately 10% of LCH disease and is the most severe form. It is characterized by skin lesions (scaly skin involving the scalp, ear canals, and abdomen), lymphadenopathy, osteolytic lesions, and hepatosplenomegaly. Other organs involved are the spleen, brain, lungs, and bones. The presence of diabetes insipidus (DI) must be considered. Presents nonmalignant growths that represent accumulation of histiocytes. It is associated with a poor prognosis (70% mortality).