What is the prognosis if a breast ultrasound reports tumor with "fuzzy" borders?

Ill-defined borders: I cannot say that i've ever seen the term "fuzzy" in a breast ultrasound report. In an effort to improve communication of radiology reports, a system is in place to objectively categorize all mammographic and sonographic abnormalities, called birads. If this was considered a birads 4 or 5 abnormality, the radiologist was suspicious enough of a cancer to recommend biopsy.