Objective:

To investigate the magnetic resonance imaging (MRI) features of solid papillary carcinoma (SPC) and to explore the diagnostic value of MRI in SPC.

Methods:

This respective

study collected 57 patients with 61 pathologically confirmed SPC between January 2017 and December 2021 Xinhua Hospital

Shanghai Jiao Tong University School of Medicine. All the patients had preoperative MRI examinations. Of the 57 patients

45 patients with 48 SPC and 52 patients with 55 SPC underwent preoperative mammography and ultrasound examination respectively. The detection rate and diagnostic accuracy of mammography

ultrasound

and MRI for SPC based on the preoperative Breast Imaging Reporting and Data System (BI-RADS) categories were calculated. A BI-RADS ≥4A category was considered as the suspicion of malignancy. According to the morphology of the lesions

lesions was divided into non-mass enhancement (NME) and mass two groups. The difference in size and the rate of duct dilation were compared between the two groups

using the Mann-Whitney U test and the

χ

2

test

respectively.

Results:

The detection rate of mammography

ultrasound

and MRI for SPC was 64.6% (31/48)

83.6% (46/55)

and 100.0% (61/61)

respectively. The accuracy of mammography

ultrasound

and MRI for SPC was 52.1% (25/48)

65.5% (36/55)

and 98.4% (60/61)

respectively. On MRI

SPC was more commonly presented as a NME lesion than a mass lesion (67.2%

vs

32.8%). The NME lesion had a larger size ［2.5(1.6

4.0)cm

vs

1.4(1.0

1.8) cm

P

=0.001］ and a more frequent rate of duct dilation ［82.9%(34/41)

vs

25.0%(5/20)

P

＜0.001］.

Conclusion:

Breast MRI showed a higher detection rate and accuracy than mammography and ultrasound. SPC was more commonly presented as an NME lesion than a mass lesion. The NME lesion had a larger size and a more frequent rate of duct dilation.