Objective:

To explore magnetic resonance imaging (MRI) features of encapsulated papillary carcinoma (EPC) and differential diagnosis of solid and cystic breast intraductal papillomatosis (BIDP).

Methods:

The clinical and pathological data of 10 breast EPC patients and 10 solid and cystic BIDP p

atients confirmed by pathology from Jun. 2014 to Oct. 2019 in Guangdong Provincial Peoples Hospital were retrospectively analyzed. The differences in MRI features

time-signal intensity curve (TIC) types

and apparent diffusion coefficient (ADC) between the two groups were analyzed and compared.

Results:

Average age of EPC patients was (65.5011.64) years old

which was significantly greater than that of solid and cystic BIDP patients. The difference was of statistical significance (

P

=0.018). All 10 EPCs presented as masses

of which 8 cases were cystic solid masses

3 showed fluid levels and breast duct dilatation was found in 2 cases. There was statistically significant difference between the two groups of cases in the signal of fat-saturated T2WI (

P

=0.019)

and there was no significant difference in the other MRI features.

Conclusion:

The breast EPC often presented as a solid and cystic mass and the solid part often manifested high or equal signal on fat-saturated T2WI. Combining the patients age and MRI findings could contribute to distinguish breast EPC from solid and cystic BIDP.