An unusual haemarthrosis in an HIV‐seronegative haemophilia A patient

We report the case of a severe haemophilia A patient with an anti-factor VIII antibody who presented with a thigh haematoma and 1 year later with an elbow haemarthrosis infected by Salmonella enteritidis. These two infections were treated by antibiotics. The probable origin of these infections seems to be an anal fistula. The occurrence of a septic arthritis due to Salmonella is rare, and to our knowledge has never been reported in HIV-negative haemophilic patients. The differential diagnosis of haemarthrosis and septic arthritis in a haemophilic patient is also discussed.