A rare case of cardiac myxoma with light bulb–like cystic morphology: a case report

BACKGROUND: Cystic myxomas are quite rare. Moreover, few reports have evaluated the causes that constituted them. CASE SUMMARY: A 73-year-old Asian man presented for pre-operative examination of osteoarthritis, and transthoracic echocardiography (TTE) revealed an incidental intracardiac mass. Therefore, he was referred to our department for further evaluation. He had no specific symptoms or family history related to tumours and heart failure. The TTE showed a 32 × 24 mm spherical mass adherent to the left atrial septum. The upper part of the mass was cystic in formation and hypoechoic inside and resembled a light bulb. Transoesophageal echocardiography showed the feeding arteries flowing from the bottom into the cystic part. In addition, two jet strips drained from the cystic part in the direction of the mitral valve. Coronary angiography revealed the feeding arteries, which consisted mainly of the right coronary artery conus branch and the left circumflex branch, and the blood flowed into the saccular area from the feeding arteries and excreted towards the mitral valve. Surgical resection was performed due to the mobility, and the histopathology confirmed a cystic myxoma. DISCUSSION: We described the unique anatomical formation of a cystic myxoma, which consisted of an exquisite balance between the tumour-feeding arteries and the draining outlet vessels.