Objective:

To study the influencing factors and rules of changes in relative spatial position of breast lesions from MR examination posture to operation posture.

Methods:

A total of 81 cases with breast substantial lesion on MR images were chosen

and then breast imaging in supine posture based on chest scan was performed. Nipples were selected as positioning reference point to determine three position lines associated with the lesion center: depth line A

horizontal line B and height line C. The influencing factors of the changes in three position lines in two postures were investi

gated. Paired t test was used to compare the differences in three lines when positioning lesions in the two postures and the difference values were calculated. Single factor variance analysis was used to find the influencing factors of difference values of three position lines.

Results:

Menstrual status

fibroglandular tissue

lesion size

imaging manifestations and pathological type did not influence the changes in three position lines. From MR examination posture to operation posture

all position lines changed. The greatest changes took place in line A and line B. Line A averagely decreased (22.7313.40) mm

and line B averagely increased (12.6711.85) mm. And line C averagely increased (8.1610.87) mm. The lesion location had significant effects on lesion positioning (

P

0.05). Three position lines in the lesions behind nipple areola had the minimal changes

and those in the posterior and lower parts had marked changes.

Conclusion:

The changes in lesion position lines are closely related to lesion location. According to the rules of changes in lesion position lines

correction of the deviation caused by posture could improve the accuracy of resection of lesions.