Inhibitor Development in Severe Congenital Factor V Deficiency.

We report on a 10-year-old female diagnosed with severe congenital FV deficiency who developed anti-FV inhibitory antibody 3 weeks following dental procedure hemorrhage treated with FFP. The patient presented a large spontaneous gluteal hematoma. Despite multiple FFP transfusions, FV levels remained critically low, prompting suspicion of FV inhibitor development, confirmed by ELISA. Bleeding control was achieved with recombinant factor VIIa. An immune tolerance induction protocol was initiated, and administration of FFP was continued. Factor V inhibitors became undetectable after 1 year and the patient had a favorable clinical evolution without further bleeding episodes. This case reports the successful eradication of FV inhibitor using FFP exposure and immunosuppressive therapy.