Massive splenomegaly is least likely to occur in
Thrombocytosis is defined as a platelet count greater than 400 x 109/L. ... The presence of chronic thrombocytosis, thrombohemorrhagic complications, microvascular symptoms, or splenomegaly ors the diagnosis of primary thrombocytosis. Spleenomegaly is least likely to occur. Ref ganong's review of medical physiology 25e