An asymptomatic 66-year-old male patient with a multifocal intraductal papillary mucinous neoplasm (IPMN) underwent a follow-up EUS examination with a linear array echoendoscope. His medical history included diabetes, hypertension and smoking. While advancing the echoendoscope in the oesophagus, the endoscopic ultrasound (EUS) image shown was captured.
WHAT IS YOUR DIAGNOSIS?
A. Oesophageal duplication cyst
B. Aortic aneurism
C. Mediastinal cyst
D. Aortic dissection