序論：日本の形成外科では，若手医師が医局の垣根をこえて交流する機会が乏しかった。これを背景に，若手形成外科医の交流と学びの場として次世代形成外科医師ネットワーク（NUPS）が設立された。

 方法：2017～2022年に実施したオンサイト６回，オンライン８回の活動について，参加者属性，アンケート評価，講演前後の「やる気メーター」を比較検討した。

 結果：両形式とも講演内容・運営進行は高評価で，講演後に「やる気メーター」は上昇した。オンラインでは参加者数，所属施設数，関東以外からの参加が有意に増加した。

 考察：オンサイトは深い交流形成に，オンラインは参加の裾野拡大に有用であり，目的に応じた形式選択が重要と考えられた。

 結論：NUPSは若手形成外科医のモチベーション向上と交流促進に寄与した。

 Auricular defects are often caused by animal-bite injuries; however, few reports have described comprehensive management, including initial treatment and subsequent reconstruction, in such cases. We present the case of a 23-year-old woman with partial auricular loss due to a dog bite. Approximately three-fourths of the right auricle was lost, with associated cartilage exposure. Initial management included irrigation, fixation of the avulsed cartilage, and coverage with a postauricular flap. Definitive reconstruction was performed four weeks later using costal cartilage grafting, a temporoparietal fascial flap, and split-thickness skin grafting. A sterilized plaster model of the contralateral ear was used intraoperatively to optimize cartilage shaping and minimize the volume of harvested cartilage. All grafts survived completely, resulting in a satisfactory contour that allowed the patient to wear eyeglasses and face masks. Planning from the outset enabled successful one-stage reconstruction with good aesthetic outcomes.

 Parosteal lipoma is a rare subtype of lipoma (< 0.3%) that arises adjacent to bone and is often associated with periosteal reaction or ectopic ossification. Its pathogenesis remains controversial; however, proposed mechanisms include secondary periosteal reaction, primary osseous origin, and mesenchymal differentiation. We present a 53-year-old woman with bilateral supraclavicular tumors consisting of a right parosteal lipoma and a left simple lipoma. MRI revealed bilateral fat-signal lesions, with the right lesion containing low-signal areas. Surgical examination revealed that the right tumor was continuous with the mid-clavicle and contained mature bone with marrow elements, periosteal thickening, and cartilaginous tissue located separate from the bone interface. Histological examination confirmed the presence of parosteal and simple lipomas. The finding of marrow-containing bone in continuity with the clavicle could not be adequately explained by a periosteal reaction alone, suggesting underlying osseous involvement and mesenchymal differentiation or metaplastic change. The coexistence of distinct subtypes in one patient highlights lipoma heterogeneity and the influence of the local tissue environment.

 Tenosynovial chondromatosis is a relatively rare disorder that predominantly affects the fingers and toes. We report a case of tenosynovial chondromatosis arising from the inner wall of the flexor tendon sheath of the right little finger. The patient was a 50-year-old woman. She presented with decreased range of motion of the little finger and tenderness on palpation. A tumor was identified and excised together with a portion of the surrounding synovium. The patient's symptoms resolved and there was no recurrence postoperatively. The etiology of tenosynovial chondromatosis remains unclear; however, two hypotheses have been proposed: reactive metaplasia and a neoplastic process. Tenosynovial chondromatosis is characterized by a high recurrence rate. Therefore, careful postoperative follow-up is required.

 A 9-year-old girl with Goldenhar syndrome presented with microtia of the left ear and an associated webbed neck deformity that extended from the mastoid region to the acromion. A double combined Z-plasty was performed to improve cervical mobility and cosmetic appearance. The procedure effectively released the cervical skin webbing and improved the lateral neck contour without disturbing the periauricular region or compromising tissue required for future auricular reconstruction. This strategic approach preserved the integrity of the auricular surgical field and enabled the placement of a tension-free cartilage framework in the subsequent reconstruction stages. No postoperative complications, such as hypertrophic scarring or recurrence, were observed during the 3-year follow-up period. The patient achieved stable and aesthetically satisfactory outcomes in both neck contour and auricular reconstruction. This case demonstrates the utility of double combined Z-plasty for the management of webbed neck deformities associated with microtia and underscores its value as a preparatory procedure for auricular reconstruction. By avoiding disruption of the periauricular soft tissues, this technique may facilitate safe and uncompromised auricular reconstruction.