NCIt definition : A very rare, multisystem non-Langerhans cell histiocytosis that predominantly affects
adults. It is characterized by the proliferation in the tissues of lipid-laden macrophages
and the presence of multinucleated giant cells. It results in sclerosis of the long
bones and failure of the affected organs. Patients may present with bone pain, exophthalmos,
ataxia, liver failure, kidney failure, and hypopituitarism.;