Most common site of histiocytosis is -: (A) Bone, (B) Skin, (C) Lung, (D) Liver
Answer is A. Langerhan's cell histiocytosis are malignant proliferation of dendritic cells or macrophages. These proliferating cells are actually Langerhan's cells of marrow origin.Reference :Harsh Mohan textbook of pathology 6th edition pg no 385.