• Journal of Periodontal and Implant Science
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• 제52권2호
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• pp.141-154
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• 2022

Purpose: C57BL/6 mice, which are among the most common backgrounds for genetically engineered mice, are resistant to the induction of periodontitis by oral infection with periodontal pathogens. This study aimed to develop a periodontitis model in C57BL/6 mice using coaggregation between human pathogens and the mouse oral commensal Streptococcus danieliae (Sd). Methods: The abilities of Porphyromonas gingivalis ATCC 33277 (Pg33277), P. gingivalis ATCC 49417 (Pg49417), P. gingivalis KUMC-P4 (PgP4), Fusobacterium nucleatum subsp. nucleatum ATCC 25586 (Fnn), and F. nucleatum subsp. animalis KCOM 1280 (Fna) to coaggregate with Sd were tested by a sedimentation assay. The Sd-noncoaggregating Pg33277 and 2 Sd-coaggregating strains, PgP4 and Fna, were chosen for animal experiments. Eighty C57BL/6 mice received oral gavage with Sd once and subsequently received vehicle alone (sham), Fna, Pg33277, PgP4, or Fna+PgP4 6 times at 2-day intervals. Mice were evaluated at 5 or 8 weeks after the first gavage of human strains. Results: Fnn, Fna, and PgP4 efficiently coaggregated with Sd, but Pg33277 and Pg49417 did not. Alveolar bone loss was significantly higher in the PgP4 group at both time points (weeks 5 and 8) and in all experimental groups at week 8 compared with the sham group. The PgP4 group presented greater alveolar bone loss than the other experimental groups at both time points. A higher degree of alveolar bone loss accompanied higher bacterial loads in the oral cavity, the invasion of not only PgP4 but also Sd and Fna, and the serum antibody responses to these bacteria. Conclusions: Periodontitis was successfully induced in C57BL/6 mice by oral infection with a P. gingivalis strain that persists in the oral cavity through coaggregation with a mouse oral commensal bacterium. This new model will be useful for studying the role of human oral bacteria-host interactions in periodontitis using genetically engineered mice.

• Journal of Periodontal and Implant Science
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• 제35권4호
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• pp.939-948
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• 2005

The role of the periosteum on osteointegration of $Bio-Oss^{(R)}$(Geistlich, Wolhusen/Switzerland) was studied in rabbit calvarial defect. 12 New Zealand white male rabbits between 2.8 and 4 kg were included in this randomized, blinded, prospective study. Each rabbit was anesthetized with Ketamine HCl(5 mg/kg) and Xylazine HCl(1.5 ml/kg). An incision was made to the bony cranium and the periosteum was reflected. Using a 6-mm trephine bur(3i. USA), four 8-mm defects were created with copious irrigation. The defects were classified into barrier membrane($Tefgen^{(R)}$, Lifecore Biomedical. Inc, U.S.A.) only group as a control, $Bio-Oss^{(R)}$ with barrier membrane group, $Bio-Oss^{(R)}$ with periosteum covering group, and $Bio-Oss^{(R)}$ without periosteum covering group. There were 2 rabbits in each group. The wound was closed with resorbable suture materials. Rabbits were sacrificed using phentobarbital(100 mg/kg) intravenously at 1, 2, and 4 weeks after surgery. The samples were fixed in 4% paraformaldehyde, and decalcified in hydrochloric acid decalcifying solution(Fisher Scientific, Tustin, CA) at $4^{\circ}C$ for 2-4 weeks. It was embedded in paraffin and cut into 6 ${\mu}m$ thickness. The sections were stained with H & E and observed by optical microscope. The results were as follows; 1. The periosteum played an important role in osteointegration of $Bio-Oss^{(R)}$ in bone defects. 2. When the periosteum remained intact and $Bio-Oss^{(R)}$ was placed on the defect, $Bio-Oss^{(R)}$ with periosteum covering has been incorporated into the newly formed bone from 2-week postoperatively. 3. When the periosteum was removed at the surgical procedure, invasion of connective tissue took place among the granules, and new bone formation was delayed compared to periosteum covering group. Therefore, when the bone grafting was performed with periosteal incision procedure to achieve tension-free suture, the integrity of the overlying periosteum should be maintained to avoid fibrous tissue ingrowth.

• Advances in pediatric surgery
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• 제7권2호
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• pp.162-165
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• 2001

Clear Cell Sarcoma of the Kidney(CCSK) is a rare malignant childhood tumor with frequent metastasis to the bone. We report a case of right sided in a 5 month-old girl. A radical nephrectomy was performed. It was clinical stage III with renal capsular invasion and lymph node metastasis by the classification of NWTS-5. Histologic examination revealed the classic pattern of CCSK. Postoperative adjuvant chemotherapy with doxorubicin and radiotheraphy were applied.

• Investigative Magnetic Resonance Imaging
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• 제19권4호
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• pp.252-255
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• 2015

Intracranial involvement in multiple myeloma patients takes up around 1%, and is usually known to be present in the parietal bone or skull base in cases of skull vault involvement, while it presents in the dura and parenchyma in cases of intracranial involvement. Primary pachymeningeal invasion is even rarer with extremely rapid progression and very poor prognosis. It is our intent to report a case in which we had to differentiate multiple myeloma with other metastatic tumors, lymphoma, and leukemia with intracranial involvement. Our patient showed an osteolytic lesion of the skull with dural involvement and subdural mass formations.

• Journal of Korean Neurosurgical Society
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• 제38권3호
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• pp.245-247
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• 2005

Most chordomas show extradural extension and bone destruction. A 32-year-old man presented with neck pain and progressive paraparesis. He had been diagnosed a clival chordoma and underwent an operation seven years ago. Radiological studies revealed that the tumor was recurred in a retroclival area and invaded into intradural region. We removed the tumor by two staged operations. After surgery, satisfactory results were achieved.

• Journal of Chest Surgery
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• 제54권2호
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• pp.158-161
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• 2021

Chordoma is a rare malignant bone tumor originating from the embryonic notochord. Herein, we present a case of thoracic chordoma located at T3-T5 that was misdiagnosed as primary mediastinal adenocarcinoma. The patient underwent neoadjuvant chemoradiation and the disease showed little response. Due to vertebral body invasion, we performed en bloc mass removal and partial corpectomy (T4-5) in collaboration with orthopedic surgeons.

• Annals of Clinical Neurophysiology
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• 제24권2호
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• pp.79-83
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• 2022

Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin's lymphoma. Although progressive lymphadenopathy is a typical feature, extranodal involvement may also occur, including the gastrointestinal tract, skin, bone, thyroid, and testes. Central nervous system invasion is rare, so differentiating it from diseases such as inflammatory demyelinating disorder or infection is essential. DLBCL is therefore a challenge to diagnose, especially when the first findings are neurological symptoms. We report an unusual case of DLBCL that presented as transverse myelitis.

• Journal of Korean Neurosurgical Society
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• 제47권1호
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• pp.11-16
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• 2010

Objective: Abnormalities of the bone are frequently encountered in patients with meningioma, and hyperostosis and endostosis are common bone alterations in these tumors. Extensive bony destruction is very unusual in patients with meningioma. We report six cases of intracranial meningioma associated with an osteolytic lesion of the skull and discuss the underlying mechanisms that may be responsible for bone destruction in patients with meningioma. Methods: Six patients were classified into three groups, severe, moderate and mild, according to the degree of osteolytic bony destruction. The tumor was classified as intracranial or extracranial, depending on its location. We investigated the potential role of matrix metalloproteinase (MMP) in meningioma-associated osteolysis. The levels of MMP expression were determined by gelatin zymography, reverse transcription-quantitative PCR analysis (RT-PCR) and immunohistochemical analysis. Results: Complete surgical removal of the lesion was performed in each patient. Histological examination revealed benign meningioma in four cases, and two cases of atypical meningioma. Patients did not have a poor prognosis except one case of recurred atypical meningioma. Gelatin zymography and RT-PCR detected high levels of MMP-2 in almost all extracranial masses in comparison with the intracranial masses and MMP9 in two. There was no difference in the severity of bone destruction. Immunohistochemical analysis revealed MMP-2 expression in the vicinity of the bone destruction, and a few MMP-9-positive stainings were observed. Conclusion: Osteolysis of the skull in patients with meningiomas might not be indicative of malignant pathological features and poor prognosis. Invasion to the extracranial portion and osteolysis might be associated with MMP-2 expression in meningioma.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제21권3호
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• pp.257-265
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• 1999

골재생유도술에 의한 골재생과정의 생물학적 현상을 보다 구체적으로 이해하고자, 백서의 대퇴골에 인위적인 골결손부를 형성하고 비흡수성 차폐막을 설치한 다음 골재생유도 과정에서의 미세혈관의 구축 양상을 통상적인 광학 현미경적 소견 및 미세혈관주형 표본 관찰법을 중심으로 관찰한바 다음과 같은 결과를 얻었다. 광학 현미경적 소견의 초기 즉 술후 1주 및 2주 소견상 차폐막에 의해 피개된 실험부에서 보다 정연한 골성회복이 이루어졌으며, 이는 차폐막으로 인한 혈관망 형성의 양상에 의해 영향을 받는 것으로 나타났다. 즉, 차폐막에 의한 연조직 침입이 차단됨으로 인해 인접 골조직으로부터 수평적으로 들어온 혈관에 의해 규칙적인 혈관 분포를 나타내나, 대조군의 경우 연조직에서 유입된 혈관망에 의해 불규칙한 혈관망을 나타내었다. 시간이 경과되면서 재생된 결손부의 골은 재구성되면서 대조군과 실험군 사이에 골성회복의 양상은 유사하였으나, 인접 실험군의 골조직으로부터 유입된 혈관에 의해 형성된 규칙적인 혈관망이 연조직으로부터 침입한 혈관에 의해 그 규칙적인 배열이 흐트러진 대조군에 비하여 골성회복의 속도가 빨라진다는 사실을 확인하였다. 이상의 결과는 차폐막에 의한 골재생 유도과정에서 혈관의 유래와 혈관망의 정렬상태가 골성회복의 속도와 밀접한 관련이 있음을 보여주는 것이다.

• 대한골관절종양학회지
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• 제11권2호
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• pp.160-167
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• 2005

목적: 거대세포종은 대부분 대퇴골 원위부 및 경골 근위부에 주로 발생하며, 병소 내 소파술에서 광범위 절제술까지 다양한 수술 방법들이 시행되고있다. 저자들은 수술이 어렵고 재발율이 높은 슬관절 부위의 거대세포종 환자에서 재발율을 포함한 치료 성적을 분석하고, 재발율과 관련된 인자를 규명하고자 하였다. 대상 및 방법: 병리학적으로 확진 되고, 고속 바(high-speed burring)와 골 시멘트를 이용한 병소내 소파술을 시행 한 41예의 슬관절 주위 거대세포종 환자를 대상으로 하였다. 재발율과 기능적 평가를 통한 치료 성적을 분석하였으며, 성별, 연령, 종양의 위치, 크기, 연골 하골의 침범과 관절 내 침범 유무 그리고 Campanacci 분류에 따른 인자들과 재발율과의 상관관계를 통계적으로 분석하였다. 평균 추시 기간은 50(12~122) 개월이었다. 결과: 최종 추시 상 재발율은 17%였고, 재발시기는 평균 술 후 10개월이었다. Musculoskeletal Tumor Society (MSTS) Grading System에 의한 술 후의 기능 평가점수는 평균 27.8(93%)로 78%에서 만족스러운 기능을 보였다. 성별, 연령, 종양의 위치, 크기, 연골 하침범, 관절 내 침범, Campanacci 분류 등은 종양의 국소 재발과 통계적으로 유의한 상관 관계를 보이지 않았다. 결론: 슬관절 주변 거대세포종의 재발과 관련된 인자를 찾지는 못하였다. 수술적 치료로서 고속 바를 이용한 세심한 소파술과 골시멘트 충진술을 이용한 국소 절제술 만으로도 만족할 만한 결과 및 재발율을 얻을 수 있었다.