Appendicitis is encountered in about 30% of patients with equivocal findings on CT, and the diagnosis should be considered in most of these patients if they are appropriately symptomatic. However, when the appendix measures less than 9 mm alone, the likelihood of appendicitis is much smaller.
Preoperative axillary US excluded 96% of N2 and N3 invasive ductal metastases. The false-negative rate for N2 and N3 invasive lobular cancer was significantly higher than that for invasive ductal cancer, which suggests that axillary US cannot be used to exclude N2 and N3 metastases in these patients.
Fat necrosis may mimic malignancy with varying appearances on MRI. Suspicious morphologic and kinetic features may be present, necessitating biopsy to exclude new or recurrent breast cancer.
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