Computed tomography of cardiac and pericardial tumors.

Computed tomography (CT) scans in 30 patients with neoplastic involvement of the heart and pericardium were retrospectively reviewed. Computed tomography was compared with echocardiography in three of four patients with large primary cardiac tumors and in three patients with metastatic pericardial disease. Computed tomography was superior to echocardiography in determining tumor extent and site of origin of a right atrial sarcoma, as well as in assessing tumor extent and presence of pulmonary arterial hypertension in a left atrial malignant fibrous histiocytoma and a left atrial myxoma. Pericardial effusions were detected by echocardiography in two out of three patients with metastatic pericardial disease, but the malignant nature of the effusion was not recognized; in all three cases CT showed nodular pericardial thickening. Of the 23 patients with evidence on CT of direct extension of anterior mediastinal masses, bronchogenic carcinoma or mesothelioma to the pericardium 21 had nodular pericardial thickening and 2 diffuse thickening; only 6 had pericardial effusion. We conclude that CT is useful in the characterization of large primary cardiac tumors that are incompletely visualized with echocardiography. Computed tomography is superior to echocardiography in assessing tumor involvement of the pericardium because pericardial effusions are often absent; CT is also superior in identifying nodular pericardial thickening.