Giant pericardial cyst with a growing feature.

Pericardial cysts are rare and benign lesions of the heart. They are usually asymptomatic and diagnosed incidentally on echocardiography or chest X-ray. In this report, we present an extremely rare case of a symptomatic giant pericardial cyst (11.6 cm × 10.6 cm × 8 cm) of a 55-year-old male patient who was admitted to our cardiology clinic. A thoracic computed tomography (CT) in 2013 revealed a giant pericardial cyst. However, at that time, the patient was asymptomatic and follow-up was recommended. Recent thoracic CT and magnetic resonance imaging demonstrated a significantly growing feature of this cyst with impending possible complications.