Purpose
To evaluate prospectively the correlation of scar-for
mations after vacuu
m-assisted biopsy with different syste
ms and needle-sizes and interventional bleeding/post-interventional he
mato
ma.
Methods and materials
Between 01/2008 and 12/2009, 479 patients underwent vacuum-assisted biopsy under stereotactic-guidance, using the Mammotome庐-system with 11/8-gauge and ATEC庐-system with 12/9-gauge, whereas in 178 cases with representative benign histology no surgical-biopsy after vacuum-assisted biopsy was performed and at least a 2-plane-follow-up-mammogram after 6 month post-vacuum-assisted biopsy was available. Bleeding during intervention, hematoma post-intervention and scar-tissue was scored as minimal and moderate/severe. Statistical analysis included Chi-Square-trend-test, m>pm>-value <0.05 was considered to be significant.
Results
Significantly more bleedings and post-interventional hematomas for 8-gauge-Mammotome庐-system vs. 11-gauge-Mammotome庐-system (41.9%vs. 8.4%, m>pm> < 0.001/35.5%vs. 16.7%, m>pm> = 0.029), no significant-differences for the ATEC庐-systems 9-gauge vs. 12-gauge (26.9%vs. 29.7%, m>pm> = 0.799/42.3%vs. 43.2%, m>pm> = 0.596). 11-gauge-Mammotome庐-system vs. ATEC庐-12-gauge-system revealed significantly less bleedings/hematomas (8.4%vs. 29.7%, m>pm> = 0.015/16.7%vs. 43.2%, m>pm> = 0.001), no significant differences for the large-systems (m>pm> = 0.135/m>pm> = 0.352). Follow-up of Mammotome庐-11/8-gauge-system system has shown 13.1/16.1%minimal scar-formation and 1.2/3.2%moderate/severe scars, whereas ATEC庐-12/9-gauge-system has shown 10.8/3.8%minimal scar-formation and 0/11.5%moderate/severe scars, no significant differences. No significant difference was found when comparing Mammotome庐-11/8-g-systems vs. ATEC庐-12/9-g-systems (m>pm> = 0.609/m>pm> = 0.823). There was also no correlation between risk of scar-formation after occurrence of bleeding or hematoma with any examined VAB-system or any needle size in this study (m>pm> = 0.800).
Conclusion
Using larger needle-sizes significantly (Mammotome庐)/not significant for ATEC庐) more interventional bleedings and post-interventional hematomas were detected, only a tendency concerning scar-formation.