Lymphatic malformation（LM）is a rare congenital disease that often involves the cervicofacial region. Cervicofacial LM, especially in cases of microcystic LM, is often associated with skeletal abnormalities, leading to functional and aesthetic problems. To date, treatments for common LM include surgical excision, sclerotherapy, and pharmacotherapy. On the other hand, surgical excision is often the first-line treatment option for microcystic LM because sclerotherapy is less effective for microcystic LM.
　　We report 4 cases of jaw deformity caused by microcystic LM that were treated by osteotomy between April 2018 and May 2019. Case 1 had the most severe skeletal changes and three operations were performed；mandibular angle osteotomy, anterior segmental osteotomy of the mandible, and a mandibular body osteotomy. Case 2 was treated by two osteotomies；one genioplasty followed by mandibular margin osteotomy. Cases 3 and 4 were treated by orthognathic surgery and genioplasty, respectively. No major complication related to the operations was observed.
　　Regarding the operative time and amount of blood loss, there was little difference between osteotomy for LM and that for other diseases performed at our institution. Therefore, we consider osteotomy to be a safe and useful treatment option for LM-related jaw deformity.

　　Wolf-Hirschhorn syndrome is a rare genetic disorder caused by partial deletion of the short arm of chromosome 4. Although our patient was born full-term, he had a low birth weight of 2079 g. The patient exhibited facial features indicative of Wolf-Hirschhorn syndrome, such as a“Greek warrior helmet appearance”, heart disease, hydronephrosis, cleft palate, and growth impairment that was evident during the pregnancy. The confirmatory diagnosis was made by gene testing. Cleft palate repair was performed by Furlow’s method when he was one year and six months old. At that time, his body weight was 7.1 kg (－3.0 SD) . The postoperative course was uneventful. His oral intake was increased. Five years after the surgery, he weighed 12.3 kg (－2.5 SD) . Cleft palate repair is a possible option to increase the oral intake and improve the quality of life of patients with Wolf-Hirschhorn syndrome.

　　We summarize the clinical history and features of a patient with bilateral facial clefts (Tessier no. 7) and accessory maxillae.
　　A male patient exhibited bilateral cleft lip and alveolus combined with bilateral transverse facial clefts at birth. The maxilla was hyperplastic in contrast to the markedly hypoplastic mandible；the right and left ears had mild and severe conductive deafness, respectively. Accessory maxillae were located on both sides of the maxilla：two on the right and one on the left. Noncraniofacial associations were observed. Bilateral cleft lip and transverse facial clefts were repaired when he was 5 and 9 months old, respectively. At growth completion, intra-oral examination revealed prolonged retention of deciduous teeth, with a large overjet and severe anterior open bite. Computed tomography demonstrated that the accessory maxillae carried extra sets of teeth and were attached to the inferior border of the zygoma or zygomatic arch on both sides. The left mandibular ramus and condyle were hypoplastic compared with those on the right side, and the left mandibular coronoid process was absent.
　　Comprehensive treatment, including orthognathic surgery, orthodontics, and prosthodontics, is required for improvement of his quality of life.

　　Postoperative infection after treatment of facial bone fractures is rare despite the use of exogenous material.
　　We report a case of a non-clostridial gas-producing infection after initial treatment of a zygomatic bone fracture. A 19-year-old man presented with a right zygomatic bone fracture after blunt injury to the face during rugby practice. Open reduction and internal fixation using titanium plates were performed and the patient was discharged on the fifth postoperative day after an uncomplicated postoperative course. On the seventh postoperative day, the patient presented to the emergency room with fever and sudden swelling of the right cheek. CT demonstrated gas emphysema under the right buccal region and maxillary sinus, which suggested postoperative infection. Intraoral and ocular conjunctival wounds were opened, drained, and washed, and wound drainage was installed. Postoperatively, meropenem was administered and the patient was discharged on the ninth postoperative day without further complication. Wound cultures revealed a mixed infection of aerobic and anaerobic bacteria, and the diagnosis of non-clostridial gas-producing infection was made.
　　Non-clostridial gas-producing infection after primary reconstruction of a facial bone fracture, as we described, is rare, but early recognition and treatment lead to a good outcome.

　　For orbital floor fractures, surgical procedures are performed via a transorbital, transmaxillary, or endoscopic intranasal approach. Otolaryngologists mainly perform intranasal and transmaxillary procedures. Although the intranasal approach has an advantage of being minimally invasive, operations in front and outside of the orbital floor are limited. The endoscopic modified medial maxillectomy（EMMM）approach, a new technique for intranasal maxillary surgery, improved the operability and visibility. By applying EMMM to the reduction of fractures of the orbital floor, it is possible to manipulate a wide range of the orbital floor. Although intranasal surgery has expanded the range of surgical procedures, it still does not cover the entire area of the orbital floor. This approach combined with the transorbital method was useful in cases in which the fracture extended to a wide area of the orbital floor and to the anterior region.