PMC6690037_01
Heart with intracardiac thrombus. (A) Fresh specimen, anterior aspect. External appearance of the heart with fibrinous pericarditis. (B) Ten percent neutral formalin-fixed specimen, right lateral aspect. Opening of the right atrial chamber showed an intracardiac thrombus (asterisk) that extended into the right ventricular chamber. (C) Histopathological examination of the intracardiac thrombus showed a recanalized and organized (asterisk) thrombus. Hematoxylin and eosin; original magnification, 20x.
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Fibrinous pericarditis (Figure 1A) with about 30 mL of serosanguinous-type pericardial effusion was detected in the pericardial cavity. A 5.5-x4.0-x4.0-cm intracardiac thrombus was observed in the right atrial chamber; the thrombus was attached to the posterior leaflet of the tricuspid valve and extended into the right ventricular chamber (Figure 1B). Microscopic examination revealed an organized thrombus (Figure 1C) with endocardial fibrosis.
Left lung with pulmonary thromboembolus. (A) Fresh specimen. Red-white thrombus (arrowhead) in the descending branch of the left pulmonary artery. (B, C) Histopathological features of pulmonary thromboembolus showing organized (asterisk) and recanalized thrombus. Hematoxylin and eosin; original magnification, 20x in b and 100x in c.
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A pulmonary thromboembolus was grossly demonstrated in the branch of the left pulmonary artery (Figure 2A). Microscopic examination revealed the recanalized phase of the thrombus with the organizing phase at the periphery (Figure 2B and C).