Right Heart Mass in Transit with a Hemorrhagic Pericardial Effusion: A Diagnostic Dilemma

Metastatic disease to the heart is more often a post-mortem diagnosis due to non-specific symptoms and a low index of suspicion. Our case is a unique presentation of a rare case of cardiac metastasis from oropharyngeal cancer, which eluded echocardiographic diagnosis despite the presence of a hemorrhagic pericardial effusion. The cardiac metastasis, in fact, starts as pericardial seeding, as illustrated by the positron emission tomography (PET) imaging. The pericardial metastatic disease then becomes rapidly invasive into the cardiac chambers, hence presenting as a large mass on the echocardiogram and computed tomography (CT) scan of the chest. This is the first such case of pericardial metastasis from a squamous cell carcinoma of the tongue being reported and highlights the importance of an aggressive multimodality diagnostic approach in cases where such a clinical suspicion exists. While a two-dimensional (2D) echocardiogram is the most readily available modality, we recommend that this is complemented by the use of a three-dimensional (3D) echocardiogram, as well as metabolic and radiologic imaging with PET and CT scans.