Malignant disease of the pericardium, primary or secondary is uncommon. Secondary tumors are more frequent with predilection for carcinoma. A case of metastatic adenocarcinoma of pericardium is reported which had no evidence of malignancy on clinical examination, blood profile and radiological investigation, and intraoperative finding. Only pericardial biopsy was positive for metastatic adenocarcinoma.A 63 year old male presented to us with history of gradually progressive dyspnoea on exertion 4 month. 2 Dimensional Echocardiography (2 D Echo) revealed large pericardial effusion for which pericardiocentasis was done. The fluid was grossly hemorrhagic and negative for tuberculosis and malignancy. On empirical basis Anti Tubercular Treatment (ATT) was started.After 15 days he again had dyspnea on exertion. On examination liver was enlarged with normal blood pressure and heart rate. 2 D echocardiography showed signs of cardiac tamponade. Pericardial window through thoracotomy was done. Pericardial fluid cytology and pericardial biopsy were again negative for tuberculosis and malignancy. Postoperatively patient had symptomatic relief and was discharged on anti tubercular treatment.After 1 month the patient came for third time with history of dyspnoea on exertion and rest. 2 D Echocardiography showed effusio-constrictive pericarditis with loculated effusion compressing right atrium. Sternotomy was done, pericardium was found thickened, a phrenic to phrenic exicision of pericardium was done. Pericardial biopsy revealed metastatic adenocarcinoma (Fig. 1).The patient was thoroughly investigated for primary but metastatic source could not be found. There were no symptoms related to gastrointestinal system. Routine physical examination except for mild hepatomegaly and blood investigations were also normal. Computed tomographic scan for chest, abdomen, pelvis, and neck had no evidence for malignancy. Anti tubercular was stopped, patient was discharged on diuretics, and patient was doing well in follow up at 6 months.One of the important differential diagnosis was malignant mesothelioma of pericardium which was ruled out by immunohistochemistry markers in which Calretinine was negative and markers were positive for metastatic adenocarcinoma (Figs. 2, 3).
DiscussionMetastases to the heart and pericardium are much more common than primary cardiac tumors and are generally associated with a poor prognosis [1,2]. Metastases to the heart were found in 1.23% of 12,485 consecutive autopsies, compared with a 0.056% prevalence of primary cardiac tumors [1]. In autopsies at which a malignant neoplasm was diagnosed, cardiac metastases were found in 9.7-10.7% of cases [3][4][5].