Comparison of efficacy for mammography versus ultrasonography in stages T1 and Tis breast cancer

Objective To compare the efficacy of mammography versus ultrasonography in detecting stages T1 and Tis breast cancer. Methods Mammography and ultrasonograhpy data were collected for 1 630 stages T1 and Tis breast cancer from July 2011 to July 2013. Chi-square test was used to analyze the detection rate and diagnostic rate of two methods. Results Among 1 630 patients with 1 665 focus, 1 559 focus were detected by both methods. In term of detection rate, mammography had a higher rate in mostly fatty and scattered fibroglandular breast while ultrasonography offered advantages in extremely dense breast. And statistical significance existed among these groups (P 0.05). In term of diagnostic rate, mammography had a higher diagnostic rate in mostly fatty and scattered fibroglandular breast. On the contrary, ultrasonography was superior to mammography in heterogeneously and extremely dense breast. No statistical significance existed among these groups (P>0.05). Furthermore the focus were classified into mass and non-mass types based on mammographic images. As the volume of fibroglandular tissue increased, the amount of mass type focus increased while that of non-mass type focus decreased. Conclusion For stages T1 and Tis breast cancer, mammography has higher detection and diagnostic rates in mostly fatty and scattered fibroglandular breast while ultrasonography is better for heterogeneously and extremely dense breast. There are some correlations between fibroglandular and focus types based on mammographic images. Key words: Breast cancer; Stage T1 and Tis; Mammography; Ultrasonography; Efficacy