histiocytosis /his·tio·cy·to·sis/ (-si-to´sis) a condition marked by an abnormal appearance of histiocytes in the blood.
acute disseminated Langerhans cell histiocytosis Letterer-Siwe disease.
Langerhans cell histiocytosis a generic term for a group of disorders characterized by proliferation of Langerhans cells (q.v.), believed to arise from disturbances in regulation of the immune system. Lesions may be unifocal or multifocal and may involve the bone marrow, endocrine system, or lungs.
sinus histiocytosis a disorder of the lymph nodes in which the distended sinuses are filled by histiocytes, as a result of active multiplication of the littoral cells.
histiocytosis X former name for Langerhans cell h.
his·ti·o·cy·to·sis (h s t - s -t ss)n. pl. his·ti·o·cy·to·ses (-s z) Abnormal multiplication of histiocytes. Also called histocytosis. |
histiocytosis
a condition marked by the abnormal appearance of histiocytes in the blood.
cutaneous histiocytosis
a benign proliferative disease in dogs, particularly Collies and Shetland sheepdogs. there are multiple plaques or nodules in the skin or subcutaneous tissue. The cause is unknown.
lipid histiocytosis
Niemann-Pick disease.
malignant histiocytosis
a systemic, progressive invasive proliferation of neoplastic histiocytes. Recognized as a familial disorder in Bernese mountain dogs with clinical signs of respiratory disease, involvement of the central nervous system, and anemia.
systemic histiocytosis
a proliferative disorder of histiocytes with infiltrates in the skin and lymph nodes. Occurs in young Bernese mountain dogs.
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