PMC5415351_01
Computed tomographic scan of chest and 2-dimensional transthoracic echocardiographic images showing a 2.5-cm2 sessile mass attached to the inferolateral wall of the right atrium indicated by arrow.
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Further workup for right-sided pleural effusion included a transthoracic echocardiography (TTE) which showed normal left ventricular function with a 2.5-cm2 sessile mass in the RA cavity above the tricuspid valve attached to the septum (Figure 1).
(A) Gross pathologic specimen of right atrium mass revealed a thrombus with a smooth red-tan to dark red-tan surface, (B) microscopic views showed focal accumulation of hemosiderin-containing histiocytes, (C) significant deposit of fibrin, and (D) proliferation of the blood vessels and fibroblasts.
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During operation, the mass was identified near the annulus of the tricuspid valve with a small stalk and it was excised completely, including the stalk involving the endocardium of the heart (Figure 2A). Focal accumulation of hemosiderin-containing histiocytes was also noted (Figure 2B to D).