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© 2003 European Association of Cardio-Thoracic Surgery
Primary rabdomyosarcoma of the right atrium
a Department of Acquired Valve Diseases, Bakoulev Scientific Center for Cardiovascular Surgery, St. Rubliovskoe Shosse 135, Moscow, Russia
* Corresponding author. Tel.: +7-95-414-7965; fax: +7-95-414-7976 Received November 21, 2002; received in revised form March 7, 2003; accepted March 11, 2003
Rabdomyosarcoma is the rare malignant tumor of the heart. A case of a large malignant rabdomyosarcoma in a 37 year old woman is presented. The tumor arose from the anterior wall of the right atrium and was treated by surgical resection with replacement of the tricuspid valve with bioprosthesis. The patient passed two courses of adjuvant chemotherapy. Six months later transthoracic echocardiography revealed absence of any tissue masses in right atrium, superior vena cava and normal function of the bioprosthesis.
Key Words: Rabdomyosarcoma; Malignant neoplasm; Cardiac tumors
Primary tumors of the heart are rare. They occur with the frequency of 0.0010.28% of which 75% are benign and 25% are malign in origin [1]. Rabdomyosarcoma is the rare malignant tumor of the heart. It localizes mainly in the right atrium [2], however can occur in the interventricular septum [3]. This tumor is characterized with intraluminal growth, expressed invasion in myocard and cardiac valves. A case of a large malignant rabdomyosarcoma arising from the anterior wall of the right atrium treated by surgical resection is presented.
In January 2002, a 37 year old woman was admitted to the hospital because of exertional dispnea, palpitations, periferal oedema and liver enlargement, that have appeared and increased for the past 2 months. On auscultation any murmures were not found. Transesophageal 2-D echocardiography and magnetic nuclear resonance tomography revealed a huge mass inside the right atrium. The mass was fixed to the anterior wall, filled almost all atrium and extended into the superior vena cava (Fig. 1).
For excision of the mass cardiopulmonary bypass was instituted with moderate hypothermia, topical cooling and antegrade cold cardioplegia. For the venous drenage inferior vena cava, brachiocephal vena cannulas and suction from pericardium were used. Central venous pressure was monitored through the catheter in vena cava inferior. Through the right atriotomy a large wide base was found attached to the anterior wall. The mass expanded into the superior vena cava up to the brachiocephal vein with almost complete occlusion of the vessel and in the anterior cusp of the tricuspid valve. The tumor was solid, encapsulated, yellowish, had irregular surface and dimension 9x8x7 cm (Fig. 2a). The stalk of the tumor was excised with the part of the anterior wall. After extracting the mass from the superior vena cava the vein cannula was transferred into it from the brachiocephal vein. Then the tricuspid valve was completely excised and replaced with bioprosthesis. The right atrium defect was closed with the xenopericardial patch. Micrographic examination (Fig. 2b) revealed giant and fusiform cells and capillary vessels. Immunomorphological analysis with DAKO antibodies showed the presence of vimentin, desmin, myogenin in the resected specimen and proved diagnosis of rabdomyosarcoma.
Six months later transthoracic echocardiography revealed absence of any tissue masses in right atrium, superior vena cava and normal function of the bioprosthesis.
Primary malignant tumors of the heart are rare. Holley [1] reported their frequency 25% of all primary cardiac neoplasm. However, Blondeau [4] has reported the frequency of malignant tumors 10%. Department of Pathology of the Bakoulev Scientific Center for Cardiovascular Surgery dispose the material of 267 clinical cases of primary neoplasm of which 28 (10.4%) were malignant. This tumor is characterized with intraluminal growth, expressed invasion in myocard and cardiac valves and rapid obturation of the lumen. In the practice of our center we have met five cases of rabdomiosarcomas of the heart. Four of them occurred in right atrium and one in the left atrium. In our case we also met with onset and progress of clinical symptoms during 2 months. For the revealing of intracardiac tumors echocardiography and magnetic resonance imaging are used. Transesophageal echocardiography is superior than transthoracic as it provides anatomical definition of the mass [5]. It allows to distinguish tumors from thrombi and extra cardiac mass lesions [6]. The 3-D TEE additionally can assess the volume of the intracardiac masses [7]. Magnetic resonance also provides precise description of localization and extent of the tumor. For the pleural masses it can help to evaluate tumor cell type [8]. In our case we used both methods for clear diagnosis. Magnetic resonance images revealed in the right atrium a huge mass with irregular surface that attached to the anterior wall, expanded into the superior vena cava up to the brachiocephal vein and in the tricuspid valve. These data allowed us to suppose the malignant character of the mass. The microscopy and immunomorphology showed malignant rabdomyosarcoma. In the presented case we succeeded the radical excision of the neoplasm with implantation of the biological valve because of the tissue infiltration in tricuspid valve anterior cusp. The patient had two courses of chemotherapy and 6 months postoperatively there was no evidence of any tissue mass in the right atrium and vena cava superior. We consider that the urgent operation is indicated when tumor is not highly infiltrated in heart tissues. It can also be undertaken as palliative procedure in the presence of chamber obturation. We realize that in cases of secondary tumors complete resection may not be possible because of distant metastases. Nevertheless tumor should be surgically excised with obligatory radiation and/or chemotherapy. doi:10.1016/S1569-9293(03)00059-8
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