Localization of extramedullary hematopoiesis with Tc-99m-labeled monoclonal antibodies (BW 250/183).

Extramedullary hematopoiesis is of special interest to physicians because of its relation to hematologic disease. Because it normally remains asymptomatic, sites are typically found by chance. Effective diagnosis involves a specific, reliable, whole-body and low-cost method of screening.