Differential diagnosis of benign and malignant branch duct intraductal papillary mucinous neoplasm using contrast-enhanced endoscopic ultrasonography

Table 1 Clinical features of the 35 patients who were monitored

	Follow-up cases (n = 35)
Sex, M/F	18/17
Mean age ± SD, yr	67.9 ± 10.2
Mean follow-up period ± SD, mo	27.4 ± 16.7
Cyst size
Initial examination ± SD, mm	27.0 ± 11.8
Last examination ± SD, mm	30.1 ± 13.1
Changes of the cyst size
No change	29
Enlarged (≥ 10 mm)	5
Reduced (≥ 10 mm)	1
MPD diameter
Initial examination ± SD, mm	3.2 ± 1.8
Last examination ± SD, mm	3.5 ± 2.2
Changes in MPD diameter
No change	26
Enlarged (≥ 1 mm)	7
Reduced (≥ 1 mm)	2
Appearance of MNs during follow-up period	0
Followed up > 12 mo	33
Resected after follow-up	2
Pathological diagnosis
Low-grade dysplasia	0
Intermediate-grade dysplasia	0
High-grade dysplasia	2
Invasive adenocarcinoma	0

MPD: Mail pancreatic duct; MNs: Mural nodules.