A 70-year-old diabetic and hypeensive patient was being investigated for angina and a coronary angiogram was performed. Two days later, he developed fever and abdominal discomfo and dyspnea and a mottled skin rash. His great toe appeared black. His BP increased to 180/100. His creatinine was found to have risen from a pre-angiography level of 1.2 to 3.6 mg/dl. He has eosinophilia. Which one of the following statements is TRUE regarding this condition?