Antiphospholipid syndrome with hemophilia B: A case report represented by recurrent thrombosis/ bleeding attacks

Antiphospholipid syndrome is a disease presenting with arterial/ venous thrombosis and obstetrical complications. pulmonary embolism is an important pulmonary complication of antiphospholipid syndrome, whereas, intra-alveolar hemorrhage is a rarely encountered manifestation. hemophilia b is caused by factor ix deficiency that results in prolonged oozing after injuries and/or surgery, and delayed or recurrent bleeding prior to complete wound healing. antithrombotic therapy may be used for recurrent hemostatic attacks in aps; but if there is a hemostatic defect, it may lead to serious bleeding complications. here, we present a case of antiphospholipid syndrome accompanied by heterozygote methylene tetrahydrofolate reductase gene mutation (mthfr) mutation and hemophilia b.