Unfamiliar Case of Cardiac Amyloidosis with Sarcoidosis-like Abnormal Magnetic Resonance Imaging Findings

A 77-year-old man who was referred to our hospital because of dizziness and elevated troponin I level. Electrocardiography showed sinus bradycardia and a tri-fascicular block. Computed tomography revealed no coronary artery stenosis, but late gadolinium enhancement of the basal interventricular septum was detected on magnetic resonance imaging (MRI). Cardiac sarcoidosis was initially suspected, but pathological findings demonstrated extracellular amyloid deposition on the direct fast scarlet. The patient was diagnosed with cardiac amyloidosis (CA). The MRI manifestation in this case was atypical for CA; however, CA should not be overlooked.