Photodynamic therapy (PDT) is a treatment for more than 40 years, and has been improved and changed in the way of performing the technique, being a combination of three fundamental factors for its realization, which are: photosensitizing drug, LED (light emitting diodes) light source or laser and the effective presence of oxygen  .
Although it may have other applications, PDT has an approved indication for the treatment of keratinocyte skin cancer    . PDT also includes the possibility of being used in mixed infections (whatever their resistance profile as well as for combinations of bacteria, fungi, viruses and parasites) complementing conventional antimicrobial agents  .
PDT is a therapy that may result in the decrease or disappearance of the microbial load. PDT has other important actions  . The stimulation of skin healing and epithelialization presents regenerative and immunoregulatory processes, increasing the hydroxyproline content, angiogenesis and improving the modulation of collagen (attenuation of degradation and mediatory remodeling)   .
Several authors describe the laser as an advanced healing tool that accelerates and optimizes the tissue repair process   . Increased synthesis of RNA, DNA and adenosine triphosphate (ATP) is considered when the laser is used in the tissue repairment process   . It also promotes fibrovascular proliferation  , and has an immunological action   .
At the beginning of the last century, the treatment for breast cancer was mutilating, with radical surgeries, leaving aesthetic and functional sequelae in the patient and thus, greatly harming the psychological aspect. However, with a better understanding of the biological characteristics of breast tumors, surgical techniques and treatment became less radical   .
The current techniques aim to maintain the physiology of the gland and a good long-term form, with the lowest possible scar, aiming to maintain the sensitivity of the whole mammary complex. These techniques seek to pay attention to the pedicle responsible for the vascular supply of the areolopapillary complex  .
There is usually sufficient skin in the mastectomy, but there is a risk of vascular involvement with skin flaps, wound dehiscences and necrosis of the areolar complex  .
Wounds can be classified by their complexity, and can be considered simple, the one that evolves naturally for healing through three stages of inflation, cell proliferation and tissue remodeling. Or it can be considered complex, the one that affects more extensive area, that presents alteration in its natural cicatrization process, recurrent wounds that need intervention of health professionals   .
FERREIRA et al.  , define criteria to consider a complex wound: 1) extensive tegument loss, 2) presence of local infection, 3) impairment of superficial tissues viability, 4) association with systemic diseases that hinder the semiologic process of tissue repair   .
Patient’s age 62, female patient with diabetes, fibromyalgia and diagnosed with breast cancer in April 2013, being submitted to mastectomy without removal of the areolar complex of the right breast, with reconstitution and silicone prosthesis. In the left breast there were no nodules. She underwent chemotherapy and radiotherapy. In May 2017 the patient was to perform a mammoplasty of the left breast to improve the aesthetic aspect, however, a lump was found and removed in the surgical act of the mammoplasty. The histopathological report of this nodule was fragments of the left breast exhibiting focus of calcification free of neoplasia. She was referred to dermatofunctional physical therapy to perform postoperative manual lymphatic drainage on the 23rd of May. Ten drainage operations were performed, but the areolar complex began to present necrosis and the inferior junction of the T scar had dehiscence (Figure 1), and the patient was referred to the medical sector for debridement. After her return on June 23, 2017 she was submitted to treatment with PDT. The total treatment had a period of three months, but the wound healed in 19 days after the beginning of the use of PDT.
The treatment consisted of application of clobetazole and methylene blue propianate, applied throughout the two wounds and then applied the low power laser, every centimeter of distance throughout the wound. After the application was completed, the patient remained with the photopharmaceutical and sterile gauze was placed to protect.
A total of 19 appointments were performed until August 28, 2017. At the beginning of the treatment the nipple wound was 6 cm wide (Figure 2) being measured with a ruler, and at the end of the 19 visits both wounds were completely closed as shown in (Figure 3) (Table 1).
Figure 1. Necrosis of the areolar complex.
Figure 2. Breast submitted to debridement.
Figure 3. Fully healed breast.
Table 1. Sociodemographic characteristics of the patient.
After the first treatment with PDT, a reduction in wound extension and signs of neoformed tissue proliferation was observed.
In the fourth application it was observed a significant reduction in the depth of the lesion, healing island appearance.
Regarding the clinical aspects of the lesion, after 19 consultations with PDT, the following were observed: decreased depth and total closure of the wound, the region that was injured resumed its darker coloration that is typical of the nipple, and improved the sensitivity reported by the patient. The scarred region did not show scarring fibrosis.
Wound healing has been studied using various features and technologies, since it is a complex process involving biochemical alterations, interactions of several differentiated types of cells, matrix components   .
In this case report, the PDT and not only the laser were performed, believing that the association of a photofarmaco could lead to a faster and more efficient result in wound closure.
According to Lange (2017)  , necrotic wounds present a decrease in local blood flow, promoting a decrease in mitochondrial respiration and causing alterations in the cell membrane, consequently reducing sodium elimination and increasing the Na/K ratio, increasing the water inside the cell.
In this study, it was possible to observe the regeneration of the skin each day with reduction of the wound area.
In a review study on laser, the author reports that several authors postulate that the effect of the laser depends on the applied dose, wavelength and energy density according to the objectives proposed in each treated case   .
Some authors discuss the potential mechanisms of wound healing induced by PDT in relation to antimicrobial effects, as well as growing evidence that PDT itself may improve wound healing irrespective of its antimicrobial abilities. Although some effects have not yet been confirmed, it has been proposed that PDT can stimulate growth factors and an immune response   .
PDT has other actions in addition to the improvement that may result from a decrease, or disappearance, of the microbial load. It can stimulate healing and skin epithelialization through immunoregulatory and regenerative processes, such as increased hydroxyproline content, improved angiogenesis, and modulation of collagen (attenuating its degradation and mediating remodelling)  .
As noted in the present case report, healing occurred rapidly despite the patient having diabetes, which in general presents difficulties in healing. It is also observed the improvement of the local peripheral circulation and the repolarization of the areolar complex.
There are few articles describing the clinical characteristics of areolar wounds post mastopexy, as well as treatments for this. We consider that this subject is of great relevance for more advanced and fast resolution approaches.
However, there are many studies of low-power laser therapy in wound healing.
PDT has been growing as a therapy and many studies still need to be performed to prove the efficacy in infected wounds and complex wounds, especially after a re-construction as is the case in this case report.
It can be said that in this case report, the PDT was fundamental for the complete healing of the wound, and could be considered as a promising treatment.
A larger n is needed with randomized study, and in the near future, we will have important meta-analysis for these types of cases that we have treated.