False-Negative Platelet Factor 4 Antibodies and Serotonin Release Assay and the Utility of Repeat Testing in the Diagnosis of Heparin-Induced Thrombocytopenia and Thrombosis

Figure 1

(a, b) Computerized tomography angiography of the chest (axial images) showing “saddle” shaped thrombus in the pulmonary artery bifurcation extending into both trunks (arrows); (c) computerized tomography angiography of the neck (sagittal view) showing right common carotid artery bifurcation showing “saddle-shaped” thrombus in the external and internal carotid arteries (arrow); (d) digital subtraction angiography with selective right internal carotid artery injection showing middle cerebral artery inferior division occlusion (arrow); (e) magnetic resonance imaging of the brain diffusion-weighted imaging axial section showing right frontotemporal area infarction corresponding to the middle cerebral artery inferior branch occlusion.