Which form of Langerhans cell disease resembles lymphoma, affects children younger than age 3, and has a rapidly fatal course?

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Letterer-Siwe resembles lymphoma, affects children under 3 years, and has a rapidly fatal course. It is the most severe form of Langerhans cell disease. Hand-Schüller-Christian disease is the multifocal form of Langerhans cell disease. It occurs in children younger than 5 years. A classic triad is seen in 25% of patients. Eosinophilic granuloma affects older children and young adults. The chronic localized form is the same as eosinophilic granuloma.

Which Form of Langerhans Cell Disease Resembles Lymphoma, Affects Children