Unravelling Acquired Hemophilia A in an Ambiguous Clinical Picture.

Acquired hemophilia A (AHA) is characterized by the development of neutralizing autoantibodies, called "inhibitors," against intrinsic factor VIII. Its presentation differs profoundly from congenital hemophilia. Here, we present the case of a 69-year-old patient presenting with right-sided flank pain and hematuria, initially diagnosed with acute pyelonephritis, who was found to have bilateral renal hemorrhage during the course of his hospitalization. Later, after a thorough diagnostic evaluation, he was deemed to have AHA.