The case demonstrates typical findings of malignant pericardial disease. 

Two months later, the patient presented with worsening symptoms. 

An echocardiogram showed moderate pericardial effusion (cardiac tamponade). 1200 ml of dark brown/hemorrhagic pericardial fluid was aspirated.

Cytological evaluation of the pericardial fluid showed clusters of malignant cells, suggestive of metastatic carcinoma of breast origin.