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Malignant hemangiopericytoma has been diagnosed using echocardiography in the right ventricular outflow tract and pulmonary artery with formation of a pseudoaneurysm in the latter. (J Cardiol 1987 Jun;17(2):399-410)
It has caused rupture of the right atrial wall with chronic cardiac tamponade. (Jpn Circ J 1991 Dec;55(12):1206-10)
A left atrial hemangiopericytoma suddenly stayed stuck in the mitral orifice requiring urgent open heart surgery. (Ann Thorac Surg 1994 Nov;58(5):1544-6)


Pediatr Cardiol 1995 Jan-Feb;16(1):48-50
Right atrial hemangiopericytoma with hemopericardium during infancy.
Kawakami K, Horigome H, Tsuchida M, Hirano T, Ohtani S, Kojima M.
Department of Pediatrics, Ibaraki Children's Hospital, Japan.

A male infant with benign hemangiopericytoma of the right atrium is reported. His chief complaint was acute respiratory distress secondary to bloody pericardial effusion. Although the entire mass could not be removed surgically, there was no recurrence of cardiac tamponade or growth of the residual mass during a follow-up period of 3 years. This patient is, to our knowledge, the youngest one with primary cardiac hemangiopericytoma so far reported.

Ann Thorac Surg 1994 Nov;58(5):1544-6
Cardiac hemangiopericytoma growing in the left atrium.
Ohtani M, Ohnishi K, Imagawa H, Kato M, Yoshioka Y, Kumagai K, Houki T.
Division of Cardiovascular Surgery, Osaka Prefectural Hospital, Japan.

A 49-year-old woman was seen because of exertional dyspnea. Two-dimensional echocardiography revealed the presence of a large mass in the left atrium. An urgent operation was performed because the tumor suddenly stuck in the mitral orifice. The lesion, which occupied the entire left atrium, was resected during cardiopulmonary bypass. Histologic analysis revealed malignant hemangiopericytoma.

Jpn Circ J 1991 Dec;55(12):1206-10
Primary cardiac hemangiopericytoma causing rupture of the right atrium and chronic cardiac tamponade.
Fujii B, Matsuzaki M, Takashiba K, Ebihara H, Hamada Y, Ohno H, Hyakuna E, Tani S, Tamitani M.
Cardiovascular Center, Saiseikai Shimonoseki General Hospital, Yamaguchi, Japan.

A 53-year-old woman presented with symptoms of dyspnea on exertion and edema of lower extremities. Chronic cardiac tamponade caused by the rupture of the right atrial wall was diagnosed by two-dimensional contrast echocardiography. Autopsy findings revealed primary cardiac hemangiopericytoma.

J Cardiol 1987 Jun;17(2):399-410
Malignant hemangiopericytoma of the right ventricular outflow tract and the pulmonary artery: a case report
Nakamura Y, Nishiya Y, Kaseno K, Ishikawa T, Kawada M, Fujimura M, Shibuya T, Kitagawa M.
Division of Cardiology, Toyama Prefectural Central Hospital, Toyama.

A case of malignant hemangiopericytoma of the right ventricular outflow tract and the pulmonary artery associated with formation of a pseudoaneurysm in the latter is presented. This 33 year-old man had a four month history of illness. From the surgical point of view, all non-invasive modalities including phonocardiography, M-mode and two-dimensional echocardiography, radionuclide angiocardiography and contrast computed tomography underestimated the extent of the tumor as compared with the selective cineangiographic estimation. Therefore, it was suggested that in some situations where surgery is contemplated, a combination of non-invasive methods and cineangiography is essential to obtain sufficient diagnostic information, although the introduction of catheters into the right-sided cardiac chambers containing a mass might be hazardous because of potentiality dislodging portions of a tumor or adherent thrombus. Concerning pericardial abnormalities, contrast computed tomography was the most sensitive and specific method among the diagnostic techniques used in this case.

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