title: A case of congenital TTP presenting with microganiopathy in adulthood.
abstract: BACKGROUND
  Congenital thrombotic thrombocytopenic purpura (TTP), also known as Upshaw-Schulman Syndrome is a rare inherited deficiency of ADAMTS13. Unlike the more common acquired TTP which is characterized by an acquired inhibitor of ADAMTS13, patients with congenital TTP have an absolute deficiency of ADAMTS13 without an inhibitor. Congenital TTP generally presents in infancy with repeat episodes of acute hemolysis and evidence of microangiopathy, these episodes are usually triggered by illness or physiological stress. Congenital TTP can be effectively treated with plasma infusion either during acute episodes or on a prophylactic schedule to prevent episodes.
  
  
  METHODS
  We present a case of a 25 year old Caucasian woman with no know family history of hematological disorders with congenital TTP. She presented with episodes of hemolysis since infancy, but without clear evidence of microangiopathy until the age of 25. At presentation to our center the patient was documented to have thrombocytopenia, elevated creatinine, and schistocytes. She was initially treated with plasma infusion at a rate of 60 ml/hr continuously for a 24 hr period with resolution of her thrombocytopenia and hemolysis. At the time of writing this article she is maintained on a prophylactic schedule of biweekly plasma infusions at 10 mg/kg and is maintaining a normal platelet count with no evidence of hemolysis.
  
  
  CONCLUSIONS
  Congenital TTP is a rare condition, and the above case is atypical as the patient did not present with clear evidence of microangiopathy until adulthood. Although this a rare condition it is important for physicians to be aware of as it, especially the possibility of atypical presentations, as the condition is potentially fatal and effective treatment exists.
authors.affiliation: Department of Medicine, Division of Hematology, Division of Hematopathology, Queen Elizabeth II Health Sciences Centre, Capital District Health, Authority and Dalhousie University, Halifax, Nova Scotia Canada.
authors.forename: Chris D
authors.initials: CD
authors.lastname: Gallivan
authors.affiliation: Department of Pathology and Laboratory Medicine, Division of Hematopathology, Queen Elizabeth II Health Sciences Centre, Capital District Health, Authority and Dalhousie University, Halifax, Nova Scotia Canada.
authors.forename: David M
authors.initials: DM
authors.lastname: Conrad
authors.affiliation: Department of Medicine, Division of Hematology, Division of Hematopathology, Queen Elizabeth II Health Sciences Centre, Capital District Health, Authority and Dalhousie University, Halifax, Nova Scotia Canada.
authors.forename: Andrea K
authors.initials: AK
authors.lastname: Kew
keywords: ADAMTS13; Hemolysis; Microangiopathy; TTP; Upshaw-Schulman