Visualization of a malignant pericardial effusion with Tc-99m-EHDP.

Increased accumulation of radioactivity in a pericardial effusion was observed on a routine bone scan in a patient with known primary breast and lung carcinomas. A dynamic flow study and echocardiography confirmed the presence of the effusion. Microscopic examination of the pericardial fluid revealed the presence of malignant cells.