Fig. 1

Characterization of mass. a 20-year-old female with irregular heart rate noted on physical exam, which eventually led to a cardiac MRI. Short-axis T2-weighted image shows intermediate to low signal 9 × 4 cm mass originating from the inferolateral basal to mid left ventricle (arrow). b There was no immediate contrast enhancement (not shown here), but there is intense delayed contrast enhancement in short-axis inversion recovery sequence (arrow). c Four-chamber FDG-PET scan shows no abnormal uptake in the mass, indicating a benign mass. The imaging findings were thought to be suggestive of fibroma. Based upon these findings, and the patient’s lack of symptoms, a choice was made to not intervene, and instead to obtain clinical follow-up as well as serial imaging. The patient has done well over six years, and the mass has shown no interval change in size