Which test is more accurate in detecting breast cancer recurrence: a pet or an ultrasound?

Depends: This depends on if your are looking for local recurrence in the breast (ultrasound can help) or distant recurrence (in other organs outside the breast)-pet is better. They are both great tests. If you have concerns, i recommend contacting your oncology team and consider getting a second opinion.

Depends: Depends on what one is looking for. An ultrasound would only look at the breast and is often used in conjunction with a mammogram. A pet scan looks for potentially abnormal growing cells in the beast, and can also look at the entire body for abnormal cells. A biopsy would likely be needed to confirm a radiology finding.