Trisomy of group C in a myeloproliferative disorder. Report of case.

A patient with an atypical myeloproliferative syndrome characterized by leukocytosis with myeloid immaturity, ineffective extramedullary erythropoiesis, overt hemolysis and low leukocyte alkaline phosphatase activity demonstrated a trisomy in the C group of bone marrow metaphase chromosomes.

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