NO ... only a biopsy can determine if a finding is benign or malignant. Cysts however can be diagnosed by both types of imagery that you mention here. Cysts have certain characteristics that are obvious to the Radiologist. If a finding is the least bit in question a biopsy will be recommended but true cysts are rarely biopsied. Often there may be a malignancy that is also obvious due to it's specific characteristics and will be deemed Highly Suspicious for malignancy but it will still take a biopsy to be certain. Regards ....
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