Myocardial lipofuscinosis of unknown etiology in a young asymptomatic woman

: An asymptomatic 32-year-old woman was examined because of a family history of unexplained sudden deaths and a left ventricular strain pattern of the ECG during a routine examination. No abnormal finding of the cardiovascular system was present but an endomyocardial biopsy showed focal interstitial fibrosis, myocyte hypertrophy with heavy perinuclear accumulation of lipofuscin. The cause of these abnormalities remains unknown.