Rationale: Although regional metastasis to the lymph nodes is common in advanced oral cancer, extensive local invasion into surrounding structures such as the mandible, skin and soft tissue of the neck, and masticator space is relatively rare. Sometimes surgical treatment cannot be performed and only palliative chemotherapy and radiation therapy are offered to preserve the quality of life of patients with advanced oral cancer. Nevertheless, the surgical resection of tumors remains the most effective treatment. This study presents a case of aggressive mouth floor cancer in which extensive composite defects on the mouth floor, oral mucosa, mandible, skin and soft tissue of the neck caused by tumor resection were reconstructed.Patient concerns: A 66-year-old man and a 65-year-old man with no significant personal or family history visited our clinic due to a large and multiple masses on the floor of the mouth and both sides of the neck.Diagnosis: Histopathological evaluation of the biopsy specimen revealed squamous cell carcinoma.Interventions: A fibula osteocutaneous free flap and customized titanium plate were used for the intraoral lining. Mandibular reconstruction was performed using a 3D-printed bone model, and an anterolateral thigh free flap was used to resurface the anterior of the neck.Outcomes: Reconstruction using this method was successful, and excellent functional and aesthetic outcomes were achieved without cancer recurrence.Lessons: This study show that the reconstruction of extensive composite defects of the oral mucosa, mandible, and neck soft tissue following surgical resection of mouth floor cancer can be performed in a single-stage operation. Through a single-stage reconstruction, both excellent functional aspects without cancer recurrence and satisfactory aesthetic outcomes can be obtained.Abbreviations: 3D = three-dimensional, ALT = anterolateral thigh, CT = computed tomography, HNC = head and neck cancer, MRND = modified radical neck dissection, SCC = squamous cell carcinoma.

Breast augmentation mastopexy is a common procedure in cosmetic plastic surgery. Augmentation mastopexy has proven to be a relatively safe operation, but surgeons should be aware of and able to cope with disastrous complications such as soft tissue necrosis and nipple loss. The most important consideration in breast reconstruction is the recovery of breast shape and symmetry, as well as the maintenance of the shape of the nipple-areolar complex without any complications. We experienced a case of sequential breast and nipple-areolar complex reconstruction, in which the purse-string suture technique was used to repair medium-sized circular defects accompanied by nipple loss in the central area of both breasts and to preserve the shape of both breast mounds. Modified CV flaps were performed for left nipple reconstruction, and the Elsahy method and the purse-string suture technique were used to reconstruct the right nipple. Tattooing was performed on both breasts for areolar reconstruction. Through sequential reconstruction, the patient achieved satisfactory aesthetic results. In medium-sized, round defects on the central breast accompanied by nipple loss, the pursestring technique is a simple and effective reconstructive option that enables maintenance of the breast mound shape without requiring additional incision or distortion of surrounding structures.

Background: Benzalkonium chloride (BAC) is widely used as an effective antiseptic and disinfectant not only in plastic surgery, but also in everyday life. BAC has an advantage over other antiseptics used for preoperative skin preparation, such as povidone-iodine and chlorhexidine because it causes less irritation of the skin and mucosa and is less toxic. Nonetheless, when BAC is used at higher than desired concentrations, there is a possibility of adverse effects.Methods: Prior to May 2020, 10 mL of 10% BAC was mixed with 1,000 mL of distilled water and diluted to 0.1% on a weekly basis. Afterwards, the method of diluting BAC was modified; for each patient, 1.3 mL of 10% BAC and 100 mL of normal saline were mixed immediately before facial surgery.Results: From March 2007 to May 2020, 0.1% BAC was used for preoperative skin and mucosa preparation. Erroneous dilution of BAC has caused four cases of chemical burns. All the cases were attributed to human error that resulted in higher than desired concentrations of BAC in the antiseptic solution. All the affected patients suffered from first-degree and superficial second-degree chemical burns; however, they were healed uneventfully through proper wound management. Since the application of the dilution method changed since May 2020, no complications have been reported.Conclusion: We have devised a safe and aseptic method for diluting BAC. The new dilution method, which yields a constant concentration of BAC, can be used for preoperative skin and mucosa preparation without accidents.