Hamartoma of Mature Cardiac Myocytes Mimicking Malignancy on 18F-FDG PET/CT Images.

Hamartoma of mature cardiac myocytes is an extremely rare type of benign cardiac tumor with a slow growth rate and generally occurs in adults. We report a case with hamartoma of mature cardiac myocytes of the right auricle demonstrating intense F-FDG uptake and a large amount of pericardial effusion on PET/CT mimicking malignancy in a 41-year-old man. Hamartoma of mature cardiac myocytes should be considered among the differential diagnoses when an F-FDG-avid primary focal cardiac mass is found in patients with malignant features on PET/CT imaging.