Introduction: A new healthcare era is now beginning in Istria. In the new hospital, our service has begun performing new diagnostic and therapeutic procedures. One of these procedures is the transesophageal echocardiography (TEE) (1). Until now, we have performed five procedures. We will present a rare case of a cardiac tumor located in the right atrium.

Case report: Patient V.N., born in 1962, was admitted to the Cardiology Unit after a thoracic CT scan, performed under the National Lung Cancer Early Detection Programme. The patient’s general condition was good, his only complaints relating to quickly becoming fatigued, sweating. No chest pains and no losses of consciousness. ECG sinus rhythm 72/min. Smoker. Upon treating the patient, we ruled out pulmonary embolism. Taking the appearance of the growth into account, it appears to be a large tumor mass in the right atrium and ventricle, 8.9x5.2 cm. Myxomas are the most common cardiac tumors and 75% of all detected cases are in the left atrium. Our case is interesting due to its size, its appearance in the right atrium and the very few complaints in the patient’s medical history.

Conclusion: We have presented our first cardiac tumor diagnosis since we began performing the TEE diagnostic method earlier this year. Owing to our institution’s modern diagnostic facilities, the patient was treated very quickly and by agreement transferred to the Sestre milosrdnice University Hospital Centre in a good general condition.