Figure 4
From: An autopsy case of myocardial infarction due to idiopathic thrombotic thrombocytopenic purpura
High power view (400x) of the heart. (a) An eosinophilic thrombus (arrow head) detected in the blood vessel, lined by enlarged endothelial cells. (b) The thrombus stains purple-red with the periodic acid Schiff stain. (c) The thrombus does not stain blue with phosphotungstic acid-hematoxylin stain. (d) The thrombus shows positive results for immunohistochemical staining for factor VIII.