Intrapericardial cyst causing cardiac tamponade in a cat

A two-year-old cat with episodic dyspnea was diagnosed with an intrapericar dial cyst via two-dimensional echocardiography, The cyst directly compresse d the right ventricle, resulting in cardiac tamponade. Centesis of the cyst was performed to reduce tamponade prior to surgery. At surgery, a large, f luid-filled cystic structure was found within the pericardium, The cystic s tructure was continuous with a pedicle of liver that passed through a small peritoneopericardial diaphragmatic hernia, Surgical resolution was achieve d by median sternotomy, midline pericardotomy, resection of the cyst, and d iaphragmatic herniorrhaphy.