Metastases to breast
 Discussion of Metastases to breast
- Breast metastases from nonmammary primary tumors are uncommon (0.5%–2.0% of all breast malignancies).
- Metastases do not tend to cause retraction of the skin or nipple.
- Metastatic lesions are much more likely to be multiple or bilateral than primary cancers.
- Metastases are often found in the subcutaneous fat, whereas primary breast cancers develop in the glandular tissue.
- The most common extramammary cancers that metastasize to the breast are:
 Imaging Findings for Metastases to breast
- At mammography, metastatic lesions may manifest as single or multiple masses or as diffuse skin thickening. Metastases usually appear as round masses with circumscribed or ill-defined borders.
- At US, metastatic masses tend to have circumscribed margins with low-level internal echoes and, occasionally, posterior acoustic enhancement.
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 References for Metastases to breast
- Jay M. Feder, Ellen Shaw de Paredes, Jacquelyn P. Hogge, and Jennifer J. Wilken. Unusual Breast Lesions: Radiologic-Pathologic Correlation. RadioGraphics 1999 19: 11-26.