Patronum explained my health report in the office

Last month, I underwent a biopsy; the results showed nothing serious, but there were some personal details written in the report. I had brought a document from the hospital when I took a day off from work. Today, I learned that my boss had mentioned the details from that report in the office. I could tell by the strange looks I was getting. Shouldn't this matter have been private? What should I do now?