Cardiac varix is a rare entity. It is generally small and is in relation to the interatrial septum, often mistaken as cardiac myxoma. A 19-year-old girl, on evaluation of respiratory infection, was found to have a mass compressing the right atrium. Computed tomographic scan and magnetic resonance imaging suggested a differential diagnosis of pericardial cyst or hydatid cyst. Peroperatively, a large (8 x 6.5 x 5.5 cm) cystic lesion in relation to the right atrial free wall was found. The histopathology of the resected mass revealed it to be a cardiac varix. The case is notable for its large size and its location in relation to the right atrial free wall.
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"They are situated in the lower part of the interatrial septum and rarely exceed 20 mm in diameter. However, in this case, a large cardiac varix (80 × 65 × 55 mm) was found in relation to the right atrial free wall, presenting as a mass compressing the right atrium . Rasmussen et al.  reported that a cardiac varix supplied by atrial branches of both the right and left coronary arteries made it more likely that the lesion was an arteriovenous malformation rather than a venous varicosity. "
"Secondary tumors can reach the heart through the inferior vena cava and invade the right atrium as solid masses, such as renal and hepatocellular carcinoma, uterine leiomyoma or Wilms tumors . Among right atrial masses, right atrial cysts are rare and may represent hydatid, blood, bronchogenic cysts, cardiac varices or right coronary artery aneurysms [1,9,10]. Based on the appearance and location of the right atrial cysts, echocardiography helps in the differential diagnosis as follows: "
[Show abstract][Hide abstract] ABSTRACT: A 71-year-old woman presented with a right adnexal solid mass invading the right gonadal vein and inferior vena cava up to the hepatic veins revealed by CT and confirmed by MRI. A thin-walled cyst and a solid mass were unexpectedly found in the right atrium by transesophageal echocardiography (TEE) in the operating room. Using color Doppler and air bubbles as contrast material a circumscribed cyst was confirmed and localized close to the IVC. The cyst was connected to the mass in the inferior vena cava. The tumor, including the cyst, was removed without using cardiopulmonary bypass and described as a low-grade endometrial stromal sarcoma, a rare slowly growing tumor. This is the first TEE description of endometrial stromal sarcoma manifesting as a right atrial cyst.