Aimee Barrett-Theron, the world's most capped female referee with 52 Tests, has stood down from officiating with immediate effect to undergo treatment for breast cancer.

The 39-year-old Cape Town-based official — a former Springbok XVs and sevens player and the first woman to referee a men's match in South Africa — last officiated in June when she took charge of the South Africa 'A' vs Zimbabwe match at the Nelson Mandela Bay Stadium. She has notified both SA Rugby and World Rugby that she will be unavailable for the foreseeable future.

Barrett-Theron confirmed the diagnosis publicly, describing the cancer as treatable and expressing confidence in her medical team. "The good news is that it's treatable, and I'm working with an incredible team of specialists who are fully aligned with the goal of getting me healthy and back on the field in a few months' time," she said.

She used the announcement to encourage others to self-examine. "I found this through a self-check, so please let this be your reminder: check yourself, listen to your body, and don't delay getting anything unusual looked at."

SARU president Mark Alexander paid tribute to her trailblazing career. "She has had to overcome many, many barriers to reach the level of refereeing she has and we know she will take this next challenge in her stride."