[Report of a case of lung cancer with metastasis to the myocardium which showed electrocardiographic findings similar to acute myocardial infarction and intramyocardial mass on echocardiography].

A 61-year-old man was admitted to our hospital with complaints of cough and left back and chest pain. He had suffered from left tuberculous pleurisy at the age of 20 years. Chest X-ray film and CT revealed atelectasis of the left lung, a left hilar mass and an irregular left atrial wall. Depressed P-Ta segment in the inferior limb and anterior chest leads and an abnormal P wave were found on ECG. Transbronchial lung biopsy showed squamous cell carcinoma. After radiation therapy, the patient complained of chest oppression. ECG revealed a normalized P-Ta segment deviation, markedly elevated ST segment in the inferior limb and lateral chest leads and a depressed ST segment in the anterior chest leads. These findings persisted until his death. An obscure appearance of the pericardium and an echogenic intramyocardial mass in the posteroinferior and lateral wall were evident by echocardiography. The patient died due to heart failure. Postmortem needle biopsy showed scattered intramyocardial tumor cell nests with keratinization. CPK, GOT and LDH were within normal limits throughout the course, but CPK-MB was slightly increased. Cardiac metastasis with an ECG appearance similar to that of acute myocardial infarction has been rarely reported. Our present case showed peculiar feature including 1) ECG findings similar to atrial and ventricular myocardial infarction, and 2) an echogenic intramyocardial mass and an ill-defined pericardium on echocardiography. These findings suggested direct invasion of squamous cell carcinoma of the lung to the ventricular myocardium.(ABSTRACT TRUNCATED AT 250 WORDS)