• Imaging Science in Dentistry
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• 제49권3호
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• pp.209-212
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• 2019

Purpose: Fossa navicularis is a bone defect in the clivus. Familiarity with this anatomical variant is important because it is close to vital anatomical structures in the base of the skull. The aim of this study was to determine the prevalence and morphometric properties of fossa navicularis within the clivus in a Turkish subpopulation using cone-beam computed tomography (CBCT). Materials and Methods: A total of 168 CBCT scans (female: 96, male: 71) were evaluated. High-quality CBCT images of patients without a syndromic condition or a history of neurological disease or surgery were included in the study. The prevalence, depth, length, and width of the fossa navicularis were performed. Results: The prevalence of fossa navicularis was 27.5% (n=46 patients). Sex was not associated with the depth, length, or width of the fossa navicularis (P>0.05). A significant positive correlation was found between age and length of the fossa navicularis(P>0.05). Conclusion: Fossa navicularis was found to be rare (27.5%). Anatomical variants of the skull base can also be clearly identified on CBCT images. The results of this study may be useful to radiologists, anatomists, and surgeons interested in the skull base.

• Journal of Korean Neurosurgical Society
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• 제44권6호
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• pp.396-398
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• 2008

Although the incidence of unilateral abducens nerve palsy has been reported to be as high as 1% to 2.7% of head trauma cases, bilateral abducens nerve palsy following trauma is extremely rare. In this report, we present the case of a patient who developed a bilateral abducens nerve palsy and hypoglossal nerve palsy 3 days after suffering head trauma. He had a Glasgow Coma Score (GCS) of 15 points. Computed tomography (CT) images demonstrated clivus epidural hematoma and subarachnoid hemorrhage on the basal cistern. Herein, we discuss the possible mechanisms of these nerve palsies and its management.

• Anatomy and Cell Biology
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• 제56권4호
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• pp.435-440
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• 2023

Few studies have examined the basilar venous plexus (BVP) and to our knowledge, no previous study has described its histology. The present anatomical study was performed to better elucidate these structures. In ten cadavers, the BVP was dissected. The anatomical and histological evaluation of the intraluminal trabeculae within this sinus were evaluated. Once all gross measurements were made, the clivus and overlying BVP were harvested and submitted for histological analysis. A BVP was identified in all specimens and in each of these, intraluminal trabeculae were identified. The mean number of trabeculae per plexus was five. These were most concentrated in the upper half of the clivus and were more often centrally located. These septations traveled in a posterior to anterior direction and usually, from inferiorly to superiorly however some were noted to travel horizontally. In a few specimens the trabeculae had wider bases, especially on the posterior attachment to the meningeal layer of dura mater. More commonly, the trabeculae ended in a denticulate form at their two terminal ends. The trabeculae were on average were 0.85 mm in length. The mean width of the trabeculae was 0.35 mm. These septations were consistent with the cords of Willis as are found in the lumen of some of the other intradural venous sinuses. An understanding of the internal anatomy of the BVP can aid in our understanding of venous pathology. Furthermore, this knowledge will benefit patients undergoing interventional treatments that involve the BVP.

• 한국산림과학회지
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• 제95권6호
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• pp.743-750
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• 2006

쓰레기 매립지에서 생장과 적응력이 우수한 수종 및 품종을 육성하기 위하여 1997년에 포플러류 4수종(10클론)과 도입종 버드나무 1수종(2클론)을 수도권매립지에 식재한 후 1997년부터 2005년까지의 생존율, 생장, 활력, 공해 및 균 해충에 의한 엽 피해, 그리고 천공충에 의한 피해를 각각 조사하였다. 전체 생존율은 1997년에 평균 90%에서 2005년에는 53%로 크게 감소하였다. 포플러 수종 중 현사시가 2005년에 66%의 생존율을 보여 가장 우수한 반면 양황철과 이태리포플러가 41%로 가장 저조한 생존율을 보였다. 현사시 3호(Clivus) 클론이 73%로 가장 높은 생존율을 보였다. 평균 수고는 이태리포플러 Eco28호가 $11.2m{\pm}2.1m$로 가장 우수하였고 그 다음으로 Clivus($11.0m{\pm}2.0m$)였다. 반면 도입종 버드나무 클론 중에서 131-27은 $7.8m{\pm}1.6m$로 가장 저조한 수고생장을 보였다. 활력, 낙엽율, 엽피해, 그리고 천공충 피해는 클론 간에 통계적 차이가 있었다. 수종별로는 현사시와 도입종 버드나무가 활력이 강하고 매립지 환경의 다양한 스트레스에 적응력이 강한 것으로 나타났으나 양황철나무는 스트레스에 아주 민감하게 반응을 하였다. 우수 클론을 한 클론만 선발하면 현사시 3호(Clivus)를, 추가하여 선발하면 버드나무 2클론(131-25, 131-27), 현사시 4호 2클론(72-9, 72-16)을 포함하여 총 5클론을 선발할 수 있었다. 이들 5클론은 수도권매립지와 비슷한 환경에 보급할 수 있을 갓으로 판단된다.

• Journal of Korean Neurosurgical Society
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• 제58권5호
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• pp.454-461
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• 2015

Objective : In this study, we aimed to investigate the underlying ethiological factors in chiari malformation (CM) type-I (CMI) via performing volumetric and morphometric length-angle measurements. Methods : A total of 66 individuals [33 patients (20-65 years) with CMI and 33 control subjects] were included in this study. In sagittal MR images, tonsillar herniation length and concurrent anomalies were evaluated. Supratentorial, infratentorial, and total intracranial volumes were measured using Cavalieri method. Various cranial distances and angles were used to evaluate the platybasia and posterior cranial fossa (PCF) development. Results : Tonsillar herniation length was measured $9.09{\pm}3.39mm$ below foramen magnum in CM group. Tonsillar herniation/concurrent syringomyelia, concavity/defect of clivus, herniation of bulbus and fourth ventricle, basilar invagination and craniovertebral junction abnormality rates were 30.3, 27, 18, 2, 3, and 3 percent, respectively. Absence of cisterna magna was encountered in 87.9% of the patients. Total, IT and ST volumes and distance between Chamberlain line and tip of dens axis, Klaus index, clivus length, distance between internal occipital protuberance and opisthion were significantly decreased in patient group. Also in patient group, it was found that Welcher basal angle/Boogard angle increased and tentorial slope angle decreased. Conclusion : Mean cranial volume and length-angle measurement values significantly decreased and there was a congenital abnormality association in nearly 81.5 percent of the CM cases. As a result, it was concluded that CM ethiology can be attributed to multifactorial causes. Moreover, congenital defects can also give rise to this condition.

• Journal of Korean Neurosurgical Society
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• 제54권5호
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• pp.405-410
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• 2013

Objective : The objective of this study was to investigate changes in the posterior cranial fossa in patients with symptomatic Chiari malformation type I (CMI) compared to a control group. Methods : We retrospectively reviewed clinical and radiological data from 12 symptomatic patients with CMI and 24 healthy control subjects. The structures of the brain and skull base were investigated using magnetic resonance imaging. Results : The length of the clivus had significantly decreased in the CMI group than in the control group (p=0.000). The angle between the clivus and the McRae line (p<0.024), as the angle between the supraocciput and the McRae line (p<0.021), and the angle between the tentorium and a line connecting the internal occipital protuberance to the opisthion (p<0.009) were significantly larger in the CMI group than in the control group. The mean vertical length of the cerebellar hemisphere (p<0.003) and the mean length of the coronal and sagittal superoinferior aspects of the cerebellum (p<0.05) were longer in the CMI group than in the control group, while the mean length of the axial anteroposterior aspect of the cerebellum (p<0.001) was significantly shorter in the CMI group relative to control subjects. Conclusion : We elucidate the transformation of the posterior cranial fossa into the narrow funnel shape. The sufficient cephalocaudal extension of the craniectomy of the posterior cranial fossa has more decompression effect than other type extension of the craniectomy in CMI patients.

• Journal of Korean Neurosurgical Society
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• 제42권5호
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• pp.406-409
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• 2007

Craniovertebral junction (CVJ) tuberculosis is a rare disease, potentially causing severe instability and neurological deficits. The authors present a case of CVJ tuberculosis with atlantoaxial dislocation and retropharyngeal abscess in a 28-year-old man with neck pain and quadriparesis. Radiological evaluations showed a widespread extradural lesion around the clivus, C1, and C2. Two stage operations with transoral decompression and posterior occipitocervical fusion were performed. The pathological findings confirmed the diagnosis of tuberculosis. Treatment options in CVJ tuberculosis are controversial without well-defined guidelines. But radical operation (anterior decompression and posterior fusion and fixation) is necessary in patient with neurological deficit due to cord compression, extensive bone destruction, and instability or dislocation. The diagnosis and treatment options are discussed.

• Journal of Korean Neurosurgical Society
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• 제47권6호
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• pp.454-457
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• 2010

Pure ventral midline giant schwannoma is an extremely rare entity. Spinal intradural extramedullary schwannomas commonly occur posterolateral or anterolateral to the spinal cord. A case of a pure midline ventrally situated giant pan cervical extramedullary schwannoma in an 18-year-old male patient with compressive myelopathy and sphincter involvement is presented. Spinal MR imaging showed a midline ventrally situated extramedullary tumor with severe spinal cord compression extending from clivus to C7 vertebra. It was resected through a posterolateral approach. Histology was consistent with a schwannoma. Post operative MR imaging showed no evidence of the tumor. The radiological features, pathogenesis and surgical strategies in management of these difficult tumors are discussed and the relevant literature is briefly reviewed.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1991년도 제25차 학술대회 연제순서 및 초록
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• pp.38-38
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• 1991

콜레스테롤 육아종은 콜레스테롤 결정이 주위조직에 이물질로 작용하여 육아성 반응 및 골파괴 반응을 유발시키는 질환으로 병리조직학적으로 많은 콜레스테롤 결정이 거대세포를 가진 만성적인 염증성 침윤속에 나타나는것을 특징으로 한다. 이 병변은 아주 드물지만 특징적인 방사선적소견, 병리조직학적 소견과 임상양상으로 쉽게 진단이 된다. 두부에서는 다양한 위치에서 발견되는데 특히 함기화가 잘 된 측두골, 유양동, 고실강에서 많이 보이며 전두골, 상악골, 협골, 인상측두골 및 후두개와에서도 보고되고 있으나 부비동에 발생하는것은 특히 드물다. 부비동에서 발생한 콜레스테롤 육아종의 발생기전은 환기장애설, 배출장애설 및 출혈설 등으로 보고되고 있다. 저자들은 최근 복시와 측두통을 호소하는 50세 여자환자에서 접형동에 발생한 콜레스테롤 육아종이 우측 상안와열 (superior orbital fissure)과 경사대(clivus)를 파괴하며 전교조 (Prepontine cistern)로 확장된 1례를 경험하였기에 임상 증세, 특징적인 전산화단층 및 핵자기공명소견과 병리조직학적인 소견을 문헌 고찰과 함께 보고하는 바이다.

• 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.