Pre-aspiration of a large retention cyst followed by EUS-FNB for the successful diagnosis of a patient with pancreatic cancer.

Endoscopic ultrasonography-guided fine needle biopsy is an indispensable tool for the diagnosis of pancreatic tumors but is occasionally difficult to perform owing to cystic lesions that intervene with the puncture route. Yamamoto and colleagues recommend a pre-aspiration technique in patients with pancreatic cancer and a retention cyst in the puncture route.