Synchronous breast cancer
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Synchronous breast cancers are two (or more) primary breast cancers that occur in either breast at the same time.
Up to 10% of all breast cancers may be synchronous (particularly found with the use of breast MRI). The occurrence of bilaterality is greatest with invasive lobular carcinoma.
With MRI screening, there may be a 4-10% rate of contralateral breast cancers when a unilateral breast cancer is found 1.
Treatment and prognosis
The survival of women with synchronous breast cancers is worse than those with unilateral disease 3.
- metastasis to the breast from the opposite breast: unusual particularly if there is no other evidence of metastasis