Antiphospholipid syndrome (APS) is rare in children and known to cause inflammation and recurring, potentially fatal, blood clots. Researchers found that two-thirds of children with the autoimmune disease experienced additional symptoms not formally associated with APS, including low platelet counts, hemolytic anemia and livedo reticularis, a rash indicating abnormal blood flow to the skin. Investigators say the findings underscore the importance of creating pediatric-specific criteria for the diagnosis of APS.