Evolution of incidental branch-duct intraductal papillary mucinous neoplasms of the pancreas: A study with magnetic resonance imaging cholangiopancreatography

Table 2 Overall view of imaging evolution of incidental branch-duct intraductal papillary mucinous neoplasms cysts

Pattern of imaging evolution over the follow-up	Number of patients involved, n (95%CI)	Total number of cysts involved/per-patient mean number of cysts involved	Mean time of first change/mean time of last change1 (mo)	Median time of first change/median time of last change1 (mo), n (95%CI)	Mean size on baseline MRCP/Mean size at the end of the follow-up (mm)
Increase in size occurring in ≥ 1 examination	14/72	17/1.2	34.2 ± 27.2/38.6 ± 29.6	23.5 (5-79)/25.5 (5-92)	8.4 ± 5.7/13.5 ± 6.9
	19.4% (11.4-30.8)
Increase in size in ≥ 1 examination followed or alternating with a decrease in size and/or number in ≥ 1 examination	5/72	8/1.6	21.0 ± 7.4/53.6 ± 23.0	21 (12-32)/48 (23-85)	8.4 ± 3.2/13.6 ± 6.1
	6.9% (2.6-16.1)
Decrease in size occurring in ≥ 1 examination	4/72	6/1.5	15.5 ± 16.8/17.7 ± 16.9	9 (4-40)/13.5 /(4-40)	14.7 ± 7.6/10.5 ± 9.1
	5.6% (1.8-14.3)
Disappearance	2/72	2/1.0	20.0 ± 11.3/20.0 ± 11.3	20 (12-28)/20 (12-28)	10.0/0
	1.4% (0.1-8.5)
Other2	1/72	6/6.0	5/89	5/89	5.0/7.0
	1.4% (0.1-8.5)
Any type of evolution with development of alert findings	6/72	8/1.3	34.5 ± 19.9/42.1 ± 19.4	34 (15-63)/45.5 (13-71)	11.3 ± 6.4/15.8 ± 6.1
	8.3% (3.4-17.9)
Total	32/72	47/1.4	28.1 ± 22.1/39.4 ± 26.9	22.5 (4-79)/32 (4-92)	9.7 ± 5.7/12.5 ± 7.3
	44.4% (32.9-56.6)

¹In the case of more than one change in cysts aspects during the follow-up;

²See the text for details.