A single incision mastectomy, also known as periareolar mastectomy, keyhole mastectomy, or keyhole top surgery is a surgical procedure commonly chosen by individuals seeking top surgery as part of their gender affirmation journey. Unlike the double incision mastectomy which involves two incisions across the chest, the single incision mastectomy utilizes a single, usually smaller incision per breast. This technique is often preferred by individuals with smaller breast sizes or those who desire minimal scarring. In this procedure, the surgeon removes breast tissue through the incision, resulting in a more contoured chest appearance.
The Single Inscision Mastectomy is an excellent option for people who have smaller breasts (A or B cup). It is also particuarly suited to tight skin with good elasticity.
Single incision mastectomy is a low risk and safe operation.
Pros
The surgery leaves a less scar as it’s only around the border of the areola (the area of darker skin around the nipple)
Higher chances of maintaining nipple viability and likelihood of regaining sensation to the nipple (some sensory changes are common).
Cons
The surgical procedure doesn't allow for large changes in nipple position, as they remain attached
A small amount of breast tissue will have to be left behind the nipple to preserve its blood supply. This small amount of breast tissue may be palpable and may have the risk of increasing in size. It is possible to have a second surgery to remove this tissue 6 months after the initial surgery once the nipple has re-established more robust blood supply.

During a single incision mastectomy, the surgeon makes an incision around the areola to remove breast tissue, resulting in no scars on the chest, but some scarring around the nipple. These scars are often partially hidden by the nipple, creating a positive aesthetic. During the operation, the nipple can also be made smaller
Please note: For all images on this page, blue is used for body outline, light pink is used to show contouring, and dark pink is used for scar lines.
One of the primary benefits of the single incision mastectomy is its preservation of the nipple. Unlike other mastectomy techniques where the nipple is completely removed, in the single incision method, the nipple remains attached to the skin along with a small amount of breast tissue. This preservation of the nipple structure increases the likelihood of maintaining nipple sensation and viability post-surgery. This aspect of the procedure is particularly advantageous for individuals who value nipple sensation and wish to retain a more natural appearance following surgery.
The scar is limited to around the nipple, so the healing is quicker with less pain in general. There is also virtually no risk of dog ears with this approach.
Due to the limited distance for nipple movement, some individuals may prefer a wider spacing between their nipples, which may not be achievable with this technique. Additionally, a small amount of breast tissue is left behind the nipple to preserve blood supply, potentially resulting in a slightly protruded appearance of the nipple and areola. This residual tissue may shrink over time with testosterone treatment, but if it remains a concern, it can be addressed through tissue trimming in a subsequent procedure, typically 6 or more months later.
Single incision top surgery includes a range of chest reconstruction techniques that remove breast tissue through limited incisions. These techniques are primarily suited to patients with smaller chest volume and good skin elasticity, where extensive skin removal is not required.

Keyhole top surgery is a form of single-incision mastectomy in which breast tissue is removed through a small incision placed along the lower border of the areola. Unlike other chest surgery techniques, this approach does not involve removal of excess skin or repositioning of the nipple–areola complex. As a result, it is only suitable for a highly selected group of patients with a very small volume of breast tissue and excellent skin elasticity. When performed in appropriate candidates, keyhole surgery can achieve effective tissue removal with minimal external scarring and preservation of nipple sensation.
Careful pre-operative assessment is therefore essential. Keyhole top surgery is considered one of the most limited but least invasive options within the spectrum of single-incision chest surgery techniques.
The primary advantage of keyhole top surgery is the minimal extent of scarring, with the incision confined to the areolar border and often less noticeable once healed. Because the nipple–areola complex remains attached, there is a high likelihood of preserving nipple sensation. Recovery is generally faster than with more extensive techniques, as there is less disruption to skin, nerves, and surrounding tissues. In carefully selected patients, this approach can result in a smooth chest contour without the need for additional incisions or skin excision.
Keyhole top surgery is only appropriate for a small proportion of patients. If performed in individuals with insufficient skin elasticity or a larger volume of breast tissue, the outcome may include residual tissue or excess skin, which can affect chest contour. This technique does not allow for resizing or repositioning of the nipples, meaning nipple position remains unchanged from its pre-operative location. For these reasons, strict patient selection and specialist surgical assessment are critical to achieving acceptable outcomes.
Please note: For all images on this page, blue is used for body outline, light pink is used to show contouring, and dark pink is used for scar lines.

Periareolar top surgery, also known as the donut technique, is a form of single-incision chest surgery that allows for removal of breast tissue with limited skin excision. The procedure involves two circular incisions around the areola, enabling removal of a ring of excess skin and breast tissue. This technique is suited to patients with a small volume of breast tissue and good skin elasticity, where some skin tightening is required but a full double-incision mastectomy is not indicated.
Periareolar surgery occupies a middle ground between keyhole surgery, which removes no skin, and double-incision techniques, which involve more extensive skin removal and nipple grafting. Careful patient selection is essential, as outcomes depend on chest size, skin quality, and the ability of the remaining skin to heal smoothly around the areola following closure.
A key advantage of periareolar top surgery is the ability to achieve skin tightening while keeping scars confined to the border of the areola. In many patients, the scar blends with the natural pigment transition, making it less conspicuous than longer chest incisions. This technique also allows for areola resizing, which is not possible with keyhole surgery. There is a higher likelihood of regaining nipple sensation. For appropriately selected patients, periareolar surgery can provide an effective balance between contour improvement and limited scarring.
Periareolar top surgery is not suitable for patients with significant breast volume or poor skin elasticity. One potential limitation is pleating or puckering along the incision line, which occurs because a larger circle of skin is closed around a smaller areola. While this often improves over time, it may persist in some cases and is a key factor when assessing suitability for this technique. Although the areola can be resized, the nipple itself cannot be reduced or repositioned. Additionally, areolar stretching or scar widening may occur post-operatively due to tension on the closure, and revision options can be limited if significant stretching develops.

| Email: | info@simontsao.com |
| Phone: | (03) 9133 6639 |
| Fax: | (03) 7067 9936 |
| Location: | Melbourne, Australia |
| Hospitals: | Epworth Freemasons, Epworth Richmond, Warringal Private, Western Private |
Appointment booking is provided in English.
Consultations are provided in English and Mandarin Chinese.


