Abstract\nBackground: Serious thromboembolic events connected with rFVIIa therapy in hemophilia patients are rare. Only\nthree cases are reported in children, all of them with hemophilia A.\nCase presentation: We present unique case of patient with hemophilia B and high titer inhibitors to coagulation\nFIX, who developed severe renal damage due to thromboembolic event during rFVIIa therapy, associated with\nunsuspected renovascular anomalies.\nConclusion: Caution is necessary if hematuria B requires administration of rFVIIa. US color doppler renal imaging\nbefore and after drug administration should be sufficient as an early warning.
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