The patient was diagnosed with a left atrial appendage (LAA) aneurysm. He was urgently referred to a tertiary hospital, where surgical resection was performed successfully.
LAA aneurysms are very rare; approximately 100 cases have been reported thus far 1. They are usually diagnosed incidentally on imaging but do predispose to atrial tachyarrhythmias and thromboembolism. Definitive treatment consists of surgical excision 2 or clipping 3.
The mnemonic for the differential diagnosis of anterior mediastinal mass - 5Ts:
- Thymic lesions
- Thyroid lesions
- Terrible lymphoma
- Thoracic aneurysms, which can be of aortic or cardiac origin