<unk>  is a rare form of non-Langerhans-cell histiocytosis. Usually, onset is in middle age. The<unk>  involves an infiltration of lipid-laden macrophages, multinucleated giant cells, an inflammatory infiltrate of lymphocytes and histiocytes in the bone marrow, and a generalized sclerosis of the long bones.
Erdheim-Chester disease
Winchester syndrome
Juvenile idiopathic arthritis
Crystal arthritis
Reactive arthritis
Psoriatic arthritis
Jaccoud's arthropathy
Relapsing polychondritis