Related Experiment Video
Updated: May 8, 2026

03:07
Single-Port Robotic-assisted Transaxillary Breast-conserving Surgery: A Prospective, Single-arm, Non-randomized Phase IIa Clinical Trial
Published on: August 19, 2025
A new scarless oncoplastic breast-conserving surgery: modified round block technique
Hisamitsu Zaha1, Mai Onomura, Mikiko Unesoko
1Department of Breast Surgery, Nakagami Hospital, 6-25-5 Chibana, Okinawa City, Okinawa, Japan.
Breast (Edinburgh, Scotland)
|September 3, 2013
Summary
Modified Round Block Technique (MRBT) improves breast-conserving surgery outcomes by reducing scar widening and preserving areola shape. This oncoplastic technique offers satisfactory cosmetic results for breast cancer patients.
Area of Science:
- Oncoplastic surgery
- Breast cancer treatment
Background:
- Round block technique (RBT) in breast-conserving surgery can lead to late-onset scar widening and altered areola shape or position.
- Addressing these limitations is crucial for optimizing cosmetic outcomes in breast cancer patients.
Purpose of the Study:
- To introduce and evaluate a modified Round Block Technique (MRBT) designed to overcome the drawbacks of the conventional RBT.
- To assess the safety and cosmetic efficacy of MRBT in breast cancer patients.
Main Methods:
- MRBT involves a circumferential incision without periareolar skin excision, with subcutaneous dissection extending to the entire breast.
- A wound retractor facilitates widening and repositioning of the incision over the tumor for direct-vision partial mastectomy.
- The surgical wound is closed without tension.
Main Results:
- Forty breast cancer patients underwent MRBT, with a median nipple-tumor distance of 5.2 cm and median areola size of 2.8 cm.
- Satisfactory cosmetic results were achieved, characterized by minimal scar formation.
- No subsequent changes in areola shape or position were observed.
Conclusions:
- MRBT is an effective oncoplastic technique for breast-conserving surgery.
- It is particularly beneficial for patients with small areolae or tumors located distant from the nipple.
- MRBT offers improved aesthetic outcomes compared to the standard RBT.
