2356: Usefulness of preoperative breast MRI in breast cancer compared with breast US

Abstract

Objectives: The purpose of this study was to evaluate the usefulness of preoperative breast MRI in breast cancer.Methods: A total of 38 patients with breast cancer underwent surgery at our institute between October 2004 and June 2005. They were examined preoperatively with MRI and US. The maximum diameter and number of the lesions on MRI and US were measured. These measurements were subsequently compared with pathologic results. The results were divided into equal, overestimated, and underestimated group. Change of therapeutic approach based on MRI was also evaluated.Results: Breast cancer was correctly evaluated in 30 of 38 (79%) patients at MRI and 21 of 38 (55%) at US; overestimated in three of 38 (8%) at MRI and five of 38 (13%) at US; underestimated in five of 38 (13%) at MRI and 12 of 38 (32%) at US. Therapeutic approach was changed in 10 of 38 (26%) patients and all cases were undergone modified radical mastectomy.Conclusions: In conclusion, preoperative breast MRI in breast cancer patients was more accurate than breast US. Therefore, breast MRI may be a useful modality for preoperative evaluation, especially for local staging of tumor and treatment planning in patients with breast cancer. Objectives: The purpose of this study was to evaluate the usefulness of preoperative breast MRI in breast cancer. Methods: A total of 38 patients with breast cancer underwent surgery at our institute between October 2004 and June 2005. They were examined preoperatively with MRI and US. The maximum diameter and number of the lesions on MRI and US were measured. These measurements were subsequently compared with pathologic results. The results were divided into equal, overestimated, and underestimated group. Change of therapeutic approach based on MRI was also evaluated. Results: Breast cancer was correctly evaluated in 30 of 38 (79%) patients at MRI and 21 of 38 (55%) at US; overestimated in three of 38 (8%) at MRI and five of 38 (13%) at US; underestimated in five of 38 (13%) at MRI and 12 of 38 (32%) at US. Therapeutic approach was changed in 10 of 38 (26%) patients and all cases were undergone modified radical mastectomy. Conclusions: In conclusion, preoperative breast MRI in breast cancer patients was more accurate than breast US. Therefore, breast MRI may be a useful modality for preoperative evaluation, especially for local staging of tumor and treatment planning in patients with breast cancer.