We report the case of a 41-year-old man with a pericardial cyst treate
d by percutaneous aspiration and ethanol injection. He was referred to
our hospital because of electrocardiographic abnormality. On admissio
n, chest x-ray revealed a large pericardial cyst in the right cardioph
renic angle. The cyst was examined by echocardiography, computed tomog
raphy, and cytological analysis of aspiration fluid from the cyst. Eth
anol sclerosis was applied for treatment of the cyst, which had contin
ued to increase in size. There was no recurrence of the cyst 6 months
after the treatment. Percutaneous ethanol sclerosis can be the first c
hoice of treatment for pericardial cyst.