MRI for Assessment of a Cardiac Mass

A 73-year-old man with a history of metastatic malignant melanoma was referred for the assessment of a cardiac mass that was detected on surveillance computed tomography scan (Figure a).

Figure (a-f)
Figures A-F: MRI for Assessment of a Cardiac Mass
Review of a previous positron emission tomography scan showed a hypermetabolic focus in the area (Figure b). Transesophageal echocardiography revealed a large echodense right ventricular mass (Video 1). Cardiac magnetic resonance (CMR) imaging was performed. CMR steady state free precession (SSFP) cine images (Videos 2 and 3; Figure c), as well as T1-weighted (Figure d) and late gadolinium images (Figures e-f) are shown.

Which of the following statements most accurately describes the mass seen on cardiac magnetic resonance imaging?

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