 Of 158 patients ≥6 mos after diagnosis › 97 came to resection › Invasive carcinoma in 18 pts, representing  11% of those being followed  19% of those who came to resection › Of those with invasive carcinoma, 5 pts developed PDAC in region other than target cyst, representing  3.2% of those being followed  5.2% of those who came to resection