1. Metastases to the breast

2. 49-year-old woman Palpable lump in the left breast

3. Dense breasts. No lesions were seen.

4. The palpable lesion was shown on US as an irregular ill delimited mass. A primary breast tumour was suspected. However, the biopsy revealed a metastatic squamous carcinoma, probably from the lung

5. The PET scan showed multiple metastasis, including the breast (arrow). Primary lung carcinoma (curved arrow).

6. In the next slides we show several cases of metastases to the breast from extramammary malignancies

7. Multiple round masses showing some of them well-delimited margins. Other masses have obscured or indistict margins. Pathology: multiple metastases from unknown origin.

8. Irregular ill-delimited mass. The lesion resembles a primary breast cancer, but the needle core biopsy was a metastasis from adenocarcinoma of the lung.

9. Gastric adenocarcinoma. Metastasis to the breast showing as an asymmetric density (arrow).

10. Well delimited oval mass on mammography. Non Hodgkin lymphoma.

11. Liposarcoma