Table 2.

Criteria for regrading BI-RADS scores based on microvessel morphology in ultrasensitive ultrasound microvessel imaging

Agree well with benign tumors	−2
Partially agree with benign tumors	−1
No obvious benign or malignant features	0
Partially agree with malignant tumors	+1
Agree well with malignant tumors	+2
Benign tumor vessel features	Malignant tumor vessel feature
Regular/linear vessels	Chaotic vessel distribution with irregular branches Intra- and peri-tumor vessels closely connected Penetrating vessels from periphery
Intratumor vessels isolated from peritumor vessels
Fibroadenoma: continuous vessel flow along the boundary
Fibrocystic change: Avascular/hypovascular at both center and periphery

BI-RADS = Breast Imaging Reporting and Data System.