A case of pericardial mesothelioma in a cat

A 13-year old mixed-breed cat was brought to us, due to the body pain. The day after our symptomatic treatment, she suffered from driveling and dyspnea. It was evident that she was suffering from cardiac tamponade with renal failure. Her condition improved dramatically when pericardial fluid was removed. But the property examination of the removed liquid showed the possible existence of a tumor. On the 14th day she fell into cardiac tamponade again. We performed a pericardiectomy on the 28th day. The surgically removed percardium was diagnosed as malignant mesothelioma by pathological examination. On the 110th day we found a pool of hydrothorax, and by cell inspection we recognized the same cell constitution of it as that of the removed pericardial fluid. We judged it as exudativa hydrothorax caused by malignancy mesothelioma. We performed the dosage of carboplatin (CBDCA) in her thoracic cavity. As a result the remaining hydrothorax disappeared and it never showed up. Following her owner's desire, we performed only symptomatic treatments. On the 252nd day the cat died. At the time of her death we found a tumor in her epigastric region. By cytodiagnosis we recognized the mesothelium cell, which was a variant found in pericardial fluid and hydrothorax. The metastasis to her abdominal cavity was suggested.