Figure 4.

Thromboembolic events in autopsy studies. Thrombosis in situ: Borczuk et al., large thrombi (diffuse in 22 cases, focal in 7); Bryce et al., intravascular fibrin thrombi within small arteries or arterioles (in addition, 21 of 23 samples on which CD61 stains were performed had platelet aggregates and/or thrombi in small arteries, arterioles, and capillaries); Mauad et al., thrombi in small intra‐acinar branches of pulmonary artery; Skok et al., pulmonary artery thrombosis. Microthrombi: Borczuk et al., diffuse in 44 cases, focal in 13; Carsana et al., platelet‐fibrin thrombi in small arterial vessels (<1 mm); Mauad et al., thrombi in alveolar capillaries. PE, pulmonary embolism.