Table 5 Characteristics of the four patients with branch duct IPMNs with the appearance of mural nodules in the dilated branch duct during follow-up

Patient number	Age* (year)	Sex	Location	Dilated branch duct		Size of mural nodules (mm)	Diameter of MPD (mm)	Duration of follow-up (months)	Treatment	Histology
Patient number	Age* (year)	Sex	Location	Initial size (mm)	Latest size (mm)	Size of mural nodules (mm)	Diameter of MPD (mm)	Duration of follow-up (months)	Treatment	Histology
1	43	M	Head	20	30	7	12	67	PpPD	Adenoma
2	61	M	Head	15	32	6	5	143	PpPD	Carcinoma in situ
3	63	M	Tail	20	65	8	9	148	DP	Adenoma
4	74	M	Body	30	30	6	4	45	DP	Adenoma

*Age at initial diagnosis of branch duct IPMN.
DP, distal pancreatectomy; IPMN, intraductal papillary-mucinous neoplasm; M, male; PpPD, pylorus-preserving pancreaticoduodenectomy.