A novel type 2N VWF gene mutation: a case report.

: Men and boys who present with bleeding associated with low factor VIII levels and normal von Willebrand studies are assumed to have hemophilia A until proven otherwise. However, routinely available coagulation assays cannot easily distinguish mild hemophilia A from the 2N variant of von Willebrand disease. We present a case that highlights the difficulties of recognizing this diagnosis, the role of genetic testing, and the identification of a 2N variant that has not been previously described.