P.156OTHER PRIMARY BENIGN MYOCARDIAL TUMORSCardiac hemangiomas are another more common benign tumor in this age group (7,204, 205 and 206). In thereview of 129 primary cardiac tumors at Boston Children's Hospital, three (2.3%) were hemangiomas. These tumorsare almost always single and can occupy the epicardial, intramural, or intracavitary space (206). Hemangiomas arepolypoid or sessile, often with central areas of necrosis and calcification (17,62,205). They often are associatedwith nonhemorrhagic pericardial effusions. These tumors consist of large blood vessels and small vascular channelsinterdigitating within the myocardium (17,205). On echocardiography, these vascular channels appear as largeecholucent areas (17,204,205). Angiography has been used to demonstrate the highly vascular nature of thesetumors (17,62,204). Recently, MRI has also been used to differentiate the highly vascular nature of cardiac vasculartumors (68,70,71), particularly with rapid enhancement on first-pass gadolinium scanning. The importance of
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