Publications by authors named "Hiroko Yanaga"

A mastectomy is a curative treatment for breast cancer. It causes breast and soft tissue deficits, resulting in a chest with poor vascularity. Autologous tissue breast reconstruction is commonly associated with donor site morbidity.

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Background: Microtia repair requires a large volume of reconstruction material.In pediatric patients, the collectable volume of autologous cartilage is limited, and the impact of surgical invasion and donor-site morbidity can be particularly severe. The authors developed a new treatment method using cultured autologous human auricular chondrocytes that provides a sufficiently large volume of reconstruction material.

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Background: In deep partial thickness dermal burns (DDB) where greater than 50% of the dermis is lost, severe pain, scarring and contractures occur. Therefore, skin grafting may be required. In children, scar contracture occurs because scarred skin does not stretch with growth creating the need for additional scar-releasing or skin-grafting surgeries.

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Introduction: For some cases of pectus excavatum, ideal chest shape cannot be achieved solely by performing the Nuss procedure. This manuscript presents a case where the residual deformity following Nuss was corrected using injection-transplantation of cultured autologous chondrocytes.

Presentation Of Case: The treatment was performed for an 18-year-old male, who sought improvement of his chest shape after previously undergoing the Nuss procedure.

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Background: The authors have developed a unique multilayered culture method that expands to large volumes elastic chondrocytes from a small piece of human auricular cartilage. In this study, the authors applied the two-stage transplantation method for cultured auricular chondrocytes to difficult cases of nasal/chin reconstruction where subcutaneous tissue is thin or scarred.

Methods: Auricular chondrocytes were cultured and expanded to sufficiently large volumes, and then, in a two-stage transplantation process, injection-transplanted into a patient's lower abdomen, where they were regenerated into larger chondrofat composite tissue in 6 months and used as a material for nasal/chin reconstruction.

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We have developed a unique method that allows us to culture large volumes of chondrocyte expansion from a small piece of human elastic cartilage. The characteristic features of our culturing method are that fibroblast growth factor-2 (FGF2), which promotes proliferation of elastic chondrocytes, is added to a culture medium, and that cell-engineering techniques are adopted in the multilayered culture system that we have developed. We have subsequently discovered that once multilayered chondrocytes are transplanted into a human body, differentiation induction that makes use of surrounding tissue occurs in situ, and a large cartilage block is obtained through cartinogenesis and matrix formation.

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Background: Microtia is a congenital ear hypoplasia associated with auricular defects. Conventional treatment involves implanted costal cartilage. The impact of surgical invasion and donor-site morbidity can be particularly severe in pediatric patients, and the collectable volume of autologous cartilage is limited.

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Background: Conventional treatment for nasal augmentation utilizes autologous grafts, allografts, or synthetic implants such as silicon implants. Silicon implants could protrude/expose or induce nasal bone resorption. Autologous grafts are usually associated with donor site morbidity and the volume of harvested tissue is limited.

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Background: The repair of a craniofacial or nose deformity requires a large volume of reconstructive material. A conventional cartilage graft does not provide a sufficient volume of reconstructive material. Therefore, augmentation of the facial form to the defect shape is quite difficult.

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Background: Our clinic provides various reconstructive surgeries but does not have facilities for patient admission, but there is a hospital providing satisfactory post-operative treatments in our area.

Methods: During the past 3 years, 276 patients received reconstructive mammoplasty under general anesthesia at our clinic. Their post-operative conditions immediately after the recovery were evaluated with the Modified Post-Anesthesia Discharge Scoring System (MPADSS).

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In the field of dermatology and plastic and reconstructive surgery, fibrin gel is regarded as a material that promotes wound healing. To test the hypothesis that fibrin may promote the growth of the epidermis, we examined its effects on the proliferation of cultured keratinocytes. Human keratinocytes were cultivated in fibrin-coated wells, and the cell numbers and transforming growth factor (TGF)-alpha, secreted into the cultured medium, were measured.

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A new method of nasal augmentation has been developed, in which cultured autologous chondrocytes are transplanted. Using biotechnology, a piece of the choncha cartilage 1 cm2 is cultured into a gel-type mass of chondrocytes, which then is transplanted by injection into a surgically created subperiosteal skin pocket on the nasal dorsum. The augmented nose is taped and protected for 1 week.

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Excision of large oropharyngeal carcinomas that affect the base of the tongue and the soft palate severely impairs swallowing and articulation. In the present study we describe a minimally invasive technique that effectively restores swallowing and articulation by the insertion of a pectoralis major myocutaneous flap with a bilobular skin island. One lobe of the skin island is used to reconstruct the base of the tongue and the other to reconstruct the oropharynx.

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