A Case of Recurrent Metastatic Malignant Fibrous Histiocytoma in the Right Atrium Which Was Protruding into the Pericardial Space

(Department of Cardiovascular Surgery, Heart Center, Social Insurance Central General Hospital, Tokyo, Japan, and Department of Cardiovascular Surgery, Jichi Medical School*, Tochigi, Japan)

Akifusa Hariya Kenji Takazawa Koso Egi
Arata Muraoka* Yoshio Misawa*
We report a rare case of a protruding tumor from the right atrial free wall into the cardiac sac. A cardiac tumor was incidentally detected in the right atrium of a 64-year-old man by transthoracic echocardiography. The tumor was located in the right atrial anterior free wall, infiltrating the right artrial appendage near the tricuspid valve annulus. It had an irregular surface, did not have a tumor stalk, and was considerably mobile. We resected the tumor and performed cryosurgical ablation of the remnant tissue to reduce the risk of local recurrence. Histopathologic examination confirmed the tumor to be metastatic malignant fibrous histiocytoma(MFH). The postoperative course was uneventful, and the patient was discharged 11 days after surgery. Follow-up computed tomographic scans and transthoracic echocardiography did not reveal any evidence of local cardiac recurrence or distant metastasis.
  Jpn. Jpn. J. Cardiovasc. Surg. 40:202-205(2011)

Keywords:metastatic tumor of the right atrium, malignant fibrous histiocytoma, cryosurgical ablation