although it may be difficult on m mode examination to distinguish an iasa from other conditions giving rise to mobile intra-right atrial echos , such as chiari 's malformation , tricuspid valve vegetations , intraatrial tumour or thrombus or eustachian valve , 2d examination using different incidences and contrast injections generally confirms the diagnosis .
C0225844
right atrial
C0225848
eustachian valve