Pleuropericardial cyst is a rare benign mediastinal lesion, with an incidence rate of 1 per 100,000. They are usually identified during the third or fourth decades of life and are equally common in males and females. Pleuropericardial cysts are congenital mesothelial cysts, which are the result of the abnormalities in the formation of the coelomic cavities. The clinical presentation is variable and can range from asymptomatic patients in whom the diagnosis is incidental to those cases with complaints such as pain or heaviness in chest, difficulty in breathing or cough.We report a case of a 43 year-old male patient, presented with exertional dyspnoea and pain in his right anterior chest for 4 months. Clinical examination failed to show any significant findings. The posteroanterior chest x-ray showed a rounded homogenous shadow in right cardiophrenic angle. He was further evaluated by chest CT, which showed a cystic mass measuring 8 x 6 cm in its maximum diameter. Due to the variable nature of patient's complaints and grave complications associated with pleuropericardial cyst, a detailed work-up was necessary to reach a diagnosis.