Leg pain and platelet aggregates in thrombocythemic myeloproliferative disease.

In three patients with thrombocytosis secondary to myeloproliferative disorders, disabling intermittent lower extremity pain occurred in the absence of peripheral vascular insufficiency. In all patients, circulating platelet aggregates were detected. Antiplatelet therapy resulted in prompt relief of pain and the disappearance of platelet aggregates. These findings suggest that abnormal platelet function with the formation of platelet plugs in the microcirculation could be responsible for the observed symptoms and response to treatment. The value of the determination of circulating platelet aggregates in the management of this syndrome is highlighted.