In neoplastic mucinous lesions, the rate of serrated lesions, low-grade appendiceal mucinous neoplasms, high-grade appendiceal mucinous neoplasms, and mucinous adenocarcinomas was 14.0%, 69.9%, 10.8% and 5.4%, respectively. Serrated lesions included 3.2% of hyperplastic polyps, 3.2% of serrated lesions with no dysplasia, and 7.5% of dysplastic serrated lesions.