<unk>  is a rare hereditary disease found in the Bernese Mountain Dog and humans, characterized by histiocytic infiltration of the lungs and lymph nodes. The liver, spleen, and central nervous system can also be affected. Histiocytes are a component of the immune system that proliferate abnormally in this disease. In addition to its importance in veterinary medicine, the condition is also important in human pathology.
Malignant histiocytosis
Langerhans cell histiocytosis
Mast cell sarcoma
X-type histiocytosis
Sea-blue histiocytosis
Non-Langerhans cell histiocytosis
Angiomatoid fibrous histiocytoma
Non-X histiocytosis