Photograph of the filter device and Micrographs of captured debris after the procedure. A, The filter device contained a small amount of debris. B, Immunostaining for platelets with anti-CD61 antibody. The specimen, stained withanti-CD61 antibody, was positive. C, An adjacent specimen, stained with anti-fibrinogen antibody, showed positivity for fibrinogen (indicated by arrows) to surround platelets. D, Immunostaining for macrophages with anti-CD68 antibody. The specimen contained CD68-positive macrophages.