Fig. 3
Pathological findings of the proliferating tissue during pericardiectomy. a Histologic analysis shows the proliferating tissue consisting of dilated lymphatic-like structures of various sizes. Spindle-shaped smooth muscle bundles are seen around parts of the lumen. (hematoxylin and eosin) (b) Immunohistochemical tests with the D2–40 antibody show that the abnormal lymphatic vessels stain positive for the lymphatic endothelial antigen recognized by this antibody