<unk>  is a rare disorder, with less than 100 cases found in the scientific literature. The median age at diagnosis is 60 years old, but patients's ages reported in literature range from 17 years old to 91. Patients are distributed evenly between male and female. The majority of patients (90%) are diagnosed with<unk>  had a neoplastic B-cell disorder - most commonly multiple myeloma, monoclonal gammopathy of undetermined significance (MGUS) or lymphoplasmacytic lymphoma.
Crystal-storing histiocytosis
Sea-blue histiocytosis
X-type histiocytosis
Langerhans cell histiocytosis
Non-Langerhans cell histiocytosis
Non-X histiocytosis
Malignant histiocytosis
Progressive nodular histiocytosis