<prompt> Splenomegaly is least likely associated with -CMLPolycythemia rubra veraIdiopathic myelofibrosisPrimary thrombocytosis  <response>: Splenomegaly is seen in CML,polycythemia vera chronic idiopathic myelofibrosis.Whereas in primary thrombocytosis, splenomegaly is least likely associated ,but hemorrhagic thrombotic events are common. Reference :Harsh mohan textbook of pathology sixth edition pg no 360. 