Fig. 15.1
A T1-weighted image (T1WI) (left) and a fat-saturation sequence (right) from a cardiac MRI show a circumscribed mass in the right atrial wall (arrows) in the region of the crista terminalis , with high signal intensity on T1WI and signal dropout with fat saturation, consistent with an atrial lipoma
15.2.4 MR Findings
These lesions appear T1-hyperintense to myocardium with signal dropout on fat saturation sequences (Figs. 15.2 and 15.3).
Fig. 15.2
T1WI (left), fat-saturation image (middle), and GRE cine image (right) from a cardiac MRIs shows a typical lipoma in the right ventricle with increased signal intensity on T1WI (red arrow) and signal dropout on the fat saturation image (blue arrow). The mass was mobile, moving across the tricuspid valve (black arrow) with normal cardiac motion; partial obstruction of the valve was seen on the GRE cine imaging
Fig. 15.3
Two axial images from a contrast-enhanced CT scan in a 15-year-old patient shows numerous low-density, fat-containing lesions (arrows) in and along the septal myocardium of the left ventricle in a patient with known tuberous sclerosis. The findings are most consistent with residual rhabdomyoma rather than lipomas
Gradient-refocused echo (GRE) cine sequences are the best to show the relationship of the lesion to cardiac valves and coronary arteries.
15.2.5 Echocardiography
These lesions appear as a hyperechoic mass. Real-time imaging is helpful to see their relationship to cardiac valves and coronary arteries.
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