Fig. 1: Thrombosis and preexisting myelodysplasia.
From: Thromboembolism after COVID-19 vaccine in patients with preexisting thrombocytopenia
Computed tomography angiography (CTA); A coronal view shows right internal jugular vein thrombosis (arrow), B axial view shows right transverse sinus thrombosis (arrow). A massive hemorrhagic focus is observed on right hemisphere (*). C Hematoxylin and eosin stain shows numerous degranulated megakaryocytes (arrows) (scale bar 100 µm). D Normal megakaryocyte characterized by large and abundant cytoplasm with more than 50 mature platelet granules (scale bar 5 µm). E Electron micrograph displays a megakaryocyte with few mature platelet granules (square) and numerous mitochondria (scale bar 3 µm). F A completely degranulated megakaryocyte (scale bar 5 µm). Table reports laboratory test results (full results in Supplementary Table 2).
