Clinical case of inhibitor form of hemophilia B in a child

Hemophilia B is a hereditary, X-linked recessive disease caused by a violation of plasma homeostasis, resulting from a deficiency or absence of coagulation factor IX (FIX). The cause is a mutation of the Xq27 gene encoding FIX. A serious complication of this pathology is the inhibitory form, clinically manifested by the presence of IgG allo-antibodies neutralizing exogenous FIX. The article describes a clinical case of an inhibitory form of hemophilia B in a 12-year-old child.