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Abstract Pericardial cyst is a benign congenital malformation, with uncommon incidence of approximately 1 in 100 000. It accounts for 7% of all mediastinal masses and is rarely associated with complications. Prompt discrimination of this benign lesion from metastasis in a patient with malignancy is of paramount significance in deciding exact line of management. Here, we report a case of pericardial cyst masquerading as a metastatic lung carcinoma in a patient previously treated for breast carcinoma.