Final answer:
Mrs. Casanello should be informed that the biopsy results are in and encouraged to speak with her physician for details, assuring her that the news appears favorable.
Step-by-step explanation:
As someone in the position to relay medical results, Mrs. Casanello should be informed that the biopsy results have been received. However, she should be encouraged to speak directly with her physician to discuss the results in detail. This ensures that Mrs. Casanello receives the most accurate information and gives her the opportunity to ask any questions about the outcome of the breast biopsy and any subsequent steps in her care protocol. Meanwhile, you can reassure her that the news appears to be good, but be sure not to disclose specifics, as the interpretation of results should be done by medical professionals.