[A Case of Carcinomatous Pericarditis of Breast Cancer Successfully Treated with Intrapericardial Mitomycin C Instillations and Systemic Chemotherapy].

A 67-year-old woman who underwent left breast mastectomy and right breast partial mastectomy under the diagnosis of left breast cancer and suspected right breast cancer 10 years earlier was admitted because of dyspnea. Chest computed tomography revealed pericardial fluid accumulation. The patient was treated with pericardial drainage; thereby, 800 mL of bloody fluid was removed. The cytological diagnosis was malignancy. After receiving mitomycin C instillation, she underwent systemic chemotherapy and endocrine therapy. At the last follow-up more than 5 years after the recurrence, no reaccumulation of the pericardial fluid was observed, and she remained alive in good condition.