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MRI is excellent for looking at scar tissue. MRI is able to distinguish between scar tissue and recurrent tumors. Therefore, breast MRI can evaluate a significant change in the lumpectomy site. It can determine how much cancer has spread beyond the surgical site after a breast biopsy or lumpectomy.
1 For large palpable tumors, MRI can rule out cancer that extends beyond the prostate itself. 2  If your PSA rises following prostate cancer treatment, MRI can be used to identify any cancerous tissue in the periprostatic bed (the area in the pelvis where the prostate was once located), which indicates a local recurrence.