 Women with palpable or mammographically-detected suspect breast lesions with or without breast implants will be imaged. Women who are at high risk for breast cancer may also be included since these women commonly require breast MRI screening. Since some patients may have had recent core-needle biopsies and may have recent post-needle biopsy changes but plan follow-up mastectomies or excision of the biopsy site complete re-excision, we will include this group. This will allow us to obtain the broad spectrum of post-needle biopsy findings since it is a common procedure that is used prior to biopsy to evaluate patients for potential cancer multicentricity or multifocality. Women who have already undergone lumpectomy for breast cancer and have post-biopsypost-radiation changes will be eligible if they have mammographically-detected or palpable breast abnormalities which are sufficiently suspicious to merit core needle or surgical biopsy. 