Correct!
4. 1 and 3

MRI diagnosis is straightforward in classic cases of lipomatous hypertrophy and is characterized by a bilobar interatrial septal thickening revealing homogeneous high signal intensity similar to that of subcutaneous fat tissue.

The exclusively fatty nature of such masses can be seen on fat-suppressed imaging. In our patient, MRI showed that the anterior mass previously seen was consistent with the left lobe of liver protruding through a Morgagni hernia defect and showed that lipomatous infiltration was extensive, invading the superior and inferior cavoatrial junctions and both proximal vena cavae (Figure 3).

Figure 3. Lipomatous infiltration (arrows) of interatrial septum extending along SVC, IVC with compression of SVC at superior cavo-atrial junction. Three cm mass extension into right atrial wall with sparing of fossa ovalis.

Which of the following is/are true regarding lipomatous hypertrophy? (Click on the correct answer to be directed to the sixth and final page)

1. Lipomatous hypertrophy is being diagnosed more frequently with use of transthoracic echocardiography
2. Improved by preload reduction
3. Most cases are asymptomatic
4. 1 and 3
5. All of the above

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