3.0 Tesla vs 1.5 Tesla breast magnetic resonance imaging in newly diagnosed breast cancer patients

Table 3 Suspicious lesion characteristics n (%)

Characteristic	1.5 Tesla	3.0 Tesla	P value
Suspicious lesions (n)	98	206	0.001
Average number/imaged patient	1 (98/98)	1.4 (206/136)
Range	0-6	0-8
Size (mm)
mean (range)	11.9	10.5	0.27
	(3-60)	(3-94)
Biopsied lesions	88 (90)	198 (96)	0.04
Average number/biopsied patient	1.7 (88/52)	2.6 (198/75)
Method of biopsy
MRI–guided needle biopsy	43 (49)	87 (44)	0.44
Ultrasound-guided needle biopsy	13 (15)	37 (19)	0.50
Stereotactic needle biopsy	3 (3)	2 (1)	0.18
Surgical biopsy	29 (33)	72 (36)	0.60
Reason for no biopsy
Another representative lesion biopsied	6	4
Not visualized at MRI-guided biopsy	2	3
Benign correlate on ultrasound	1	1
Lost to follow-up	1	0
Morphology
Mass	37 (38	87 (42)	0.53
Nonmass-like enhancement	40 (41)	62 (30)	0.07
Focus	21 (21)	57 (28)	0.26
Kinetics
Wash-out	22 (22)	60 (29)	0.27
Plateau	41 (42)	71 (35)	0.25
Persistent	35 (36)	75 (36)	1.00
Distribution
Multifocal	34 (35)	80 (39)	0.53
Multicentric	33 (34)	50 (24)	0.10
Contralateral	31 (32)	76 (37)	0.44

Unless otherwise indicated, data are number of patients and data in parentheses are percentages. MRI: Magnetic resonance imaging.