A 5 year old boy has cough and swelling at the knee after falling on the ground with rashes on the buttocks which are non-blanching. PT 13, APTT 71, Hgb 11, WBC 8, Plt 200. Choose the most likely diagnosis?

The key is B. Hemophilia. This is a controversial key! Correct key should be E. Von-Willebrand disease. [Likely D/D may be B or C! in von willebrands disease usually there is no hemarthrosis (except in type 3) and in hemophilia no nonblanching rash (there may be bruising). isolated rise in APTT is highly suggestive of hemophilia (given case). This is an ill defined question and only likely diagnosis may be type 3 von willebrands disease].