The following are the myeloproferative disorders except-: (A) Polycythemia vera, (B) Essential thrombocytosis, (C) Chronic myeloid leukemia, (D) Hairy cell leukemia
Answer is D. Hairy cell leukemia is a B-cell malignancy characteised by the presence of hairy cells in the blood & bone marrow & splenomegaly. Myeloproliferative diseases include chronic myeloid leukaemia ,polycythaemia vera, essential thrombocythaemia,chronic idiopathic myelofibrosis,chronic neutrophilic leukaemia ,chronic eosinophilic leukaemia .Reference :Harsh mohan textbook of pathology 6th edition pg no 357 & 378.