Final answer:
The concern is that the mammographic abnormality could be a sign of a recurrence of breast cancer.
Step-by-step explanation:
The concern in this case is that the mammographic abnormality in the opposite breast of the 55-year-old woman who previously had a modified radical mastectomy for stage II carcinoma of the breast could be a sign of a recurrence of breast cancer.
After a mastectomy, there is always a risk of cancer returning in the remaining breast tissue. This is why regular follow-up and surveillance, including mammograms, are important for early detection of any new abnormalities.
If a mammographic abnormality is detected, further tests such as a biopsy may be recommended to determine if the abnormality is cancerous or not.