... providesimproved imaging of smaller masses, particularly in the atria, atrial appendages,or associated with valvular structures. Contrast-enhanced echocardiographyimproves visualization of intracardiac masses ... symptoms.Lipomas are typically located in the RA or atrial septum. They arise from the en-docardial surface and have a broad base of attachment. Lipomas have the samesignal intensity as subcutaneous and ... primary sarcomas are fibrosarcomas, osteosarcomas,leiomyosarcomas, and liposarcomas. These are all rare tumors, comprising ap-proximately 4% of primary cardiac masses. The signal intensity characteristicsof...