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https://www.readbyqxmd.com/read/29779290/-maxillary-first-premolar-with-four-canals-a-case-report
#1
Yang Meng, De-Gang Sun
This article presented a case of discovering and diagnosing three roots with four canals of the maxillary first premolar. We found and located the extra root canal by clinical diagnosis, careful observation during the operation, and multiangle X-ray. We further confirmed the existence of the three roots with four canals with the help of cone-beam computed tomography. Finally, we verified the success of the high-quality root-canal therapy through root optical microscopy.
April 1, 2018: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29777894/endoscopic-transnasal-resection-of-solitary-fibrous-tumor-in-the-optic-canal
#2
Seiei Torazawa, Masahiro Shin, Hirotaka Hasegawa, Ryohei Otani, Keisuke Ueki, Nobuhito Saito
BACKGROUND: Tumors extending into the optic canal can cause progressive visual impairment due to optic nerve compression, and prompt surgical resection is often necessary. When the tumor is located medially in the optic canal, endoscopic transnasal surgery provides a safer, less invasive alternative to trans-cranial approach. CASE DESCRIPTION: We recently encountered a case of small solitary fibrous tumor in the optic canal causing rapid visual deterioration. The radiographic findings of pre-operative imaging studies were compatible with those of meningioma; however, unlike meningioma, bleeding from the tumor was very profuse during the operation...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29775151/selection-of-endoscopic-or-transcranial-surgery-for-tuberculum-sellae-meningiomas-according-to-specific-anatomical-features-a-retrospective-multicenter-analysis-kosen-002
#3
Doo-Sik Kong, Chang-Ki Hong, Sang Duk Hong, Do-Hyun Nam, Jung-Il Lee, Ho Jun Seol, Jiwoong Oh, Dong Gyu Kim, Yong Hwy Kim
OBJECTIVE The endoscopic endonasal approach (EEA) and the transcranial approach (TCA) are good options for the treatment of tuberculum sellae (TS) meningiomas. The objective of this study was to identify the key anatomical features in TS meningiomas and compare the two surgical approaches. METHODS The authors retrospectively reviewed clinical data in 178 patients with TS meningiomas treated at 3 institutions between January 2010 and July 2016. Patients with tumors encasing the internal carotid artery or anterior cerebral artery or involving the anterior clinoid process or cavernous sinus were excluded...
May 18, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29770287/ultra-early-optic-nerve-decompression-for-the-resection-of-anterior-clinoidal-meningioma
#4
Soichi Oya, Toru Matsui
Improvement in vision is one of the main goals of surgery for anterior clinoidal meningiomas with visual deficits. Early optic nerve decompression surgery has been advocated in previous studies to achieve the best visual outcome. Through this video, the authors describe their surgical techniques to decompress the optic nerve at the very early stage of surgery. A 35-year-old patient presented with subjective blurry vision in the right eye over the last 8 months. Magnetic resonance images showed a 3.2-cm meningioma arising at the right anterior clinoid...
February 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29770286/resection-of-an-optic-canal-meningioma-through-a-contralateral-subfrontal-approach-with-endoscopic-assistance-a-2d-operative-video
#5
Moujahed Labidi, Kentaro Watanabe, Anne-Laure Bernat, Shunya Hanakita, Sébastien Froelich
Objective  To review the use of the contralateral subfrontal approach for the resection of an optic canal meningioma. Design  Operative video. Results  A meningioma, located in the inferomedial side of the optic canal ( Fig. 1 ), was found to cause significant visual deterioration. The subfrontal route was preferred to expose the tumor without mobilization of the optic nerve. Drilling of the anterior limb of the chiasmatic sulcus (limbus sphenoidale) provided adequate exposure of the medial aspect of the optic canal...
February 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29760919/anatomy-of-the-posterior-and-middle-ethmoidal-arteries-via-computed-tomography
#6
Hiroki Yamamoto, Kazuhiro Nomura, Hiroshi Hidaka, Yukio Katori, Naohiro Yoshida
Objective: The aim of this study is to investigate the anatomy of the posterior and middle ethmoidal arteries from the viewpoint of an endoscopic sinus surgeon. Methods: Based on 100 computed tomography images, the anatomical position of the posterior ethmoidal artery in relation to the posterior ethmoid cells was classified into five types. The presence of the posterior and middle ethmoidal arteries, their distance from the skull base, and their length exposed in the ethmoid cells were measured...
2018: SAGE Open Medicine
https://www.readbyqxmd.com/read/29755274/nut-carcinoma-of-the-sinonasal-tract-infiltrating-the-orbit-in-a-man-with-birdshot-chorioretinitis
#7
Wesley Chan, Martin J Bullock, Arif F Samad, Curtis W Archibald, J Godfrey Heathcote
A 48-year-old man with a history of birdshot chorioretinitis presented with blurry vision, retro-bulbar pain and sinusitis. Though visual acuity was unaffected, he had left optic disc oedema and mild restriction of left eye abduction. His symptoms progressed quickly, with diplopia in primary gaze, epistaxis from his left nostril, and a left relative afferent pupillary defect (RAPD). On computed tomography, there was a mass in the nasal cavity that extended through the left cribriform plate and lamina papyracea and posteriorly into the optic canal...
January 2018: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/29746557/optic-tract-injury-after-closed-head-traumatic-brain-injury-in-mice-a-model-of-indirect-traumatic-optic-neuropathy
#8
Nathan K Evanson, Fernanda Guilhaume-Correa, James P Herman, Michael D Goodman
Adult male C57BL/6J mice have previously been reported to have motor and memory deficits after experimental closed head traumatic brain injury (TBI), without associated gross pathologic damage or neuroimaging changes detectable by magnetic resonance imaging or diffusion tensor imaging protocols. The presence of neurologic deficits, however, suggests neural damage or dysfunction in these animals. Accordingly, we undertook a histologic analysis of mice after TBI. Gross pathology and histologic analysis using Nissl stain and NeuN immunohistochemistry demonstrated no obvious tissue damage or neuron loss...
2018: PloS One
https://www.readbyqxmd.com/read/29733386/endoscopic-resection-of-a-paraclinoid-meningioma-extending-into-the-optic-canal-2-dimensional-operative-video
#9
(no author information available yet)
No abstract text is available yet for this article.
May 4, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29729847/siope-brain-tumor-group-consensus-guideline-on-craniospinal-target-volume-delineation-for-high-precision-radiotherapy
#10
Thankamma Ajithkumar, Gail Horan, Laetitia Padovani, Nicky Thorp, Beate Timmermann, Claire Alapetite, Lorenza Gandola, Monica Ramos, Karen Van Beek, Melissa Christiaens, Yasmin Lassen-Ramshad, Henriette Magelssen, Kristina Nilsson, Frank Saran, Barbara Rombi, Rolf Kortmann, Geert O Janssens
OBJECTIVE: To develop a consensus guideline for craniospinal target volume (TV) delineation in children and young adults participating in SIOPE studies in the era of high-precision radiotherapy. METHODS AND MATERIALS: During four consensus meetings (Cambridge, Essen, Liverpool, and Marseille), conventional field-based TV has been translated into image-guided high-precision craniospinal TV by a group of expert paediatric radiation oncologists and enhanced by MRI images of liquor distribution...
May 2, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29718332/endoscopic-endonasal-transmaxillary-transshpenoidal-approach-for-excision-of-a-superior-orbital-fissure-cavernous-sinus-meningioma-2-dimensional-operative-video
#11
Ehab El Refaee, Steffen Fleck, Marc Matthes, Henry W S Schroeder
We present a 43-old-male who suffered from a slowly progressive loss of vision in the left eye. Magnetic resonance (MR) imaging revealed a well-circumscribed contrast-enhancing lesion in the region of the anterior cavernous sinus and superior orbital fissure that extended into the optic canal. A schwannoma or meningioma was suspected. A transcranial surgery performed at another institution was not successful in removing the tumor and further deterioration of vision occurred. After resection of the left middle turbinate, the sphenoid and maxillary sinus were opened...
April 28, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29714773/endoscopic-optical-coherence-tomography-enables-morphological-and-subnanometer-vibratory-imaging-of-the-porcine-cochlea-through-the-round-window
#12
Wihan Kim, Sangmin Kim, John S Oghalai, Brian E Applegate
A highly phase stable hand-held (HH) endoscopic system has been developed for optical coherence tomography and vibrometry. Designed to transit the ear canal to the middle ear space and peer through the round window (RW), it is capable of imaging the vibratory function of the cochlear soft tissues with subnanometer scale sensitivity. A side-looking, 9 cm long rigid endoscope with a distal diameter of 1.2 mm, was able to fit within the RW niche and provide imaging access. The phase stability was achieved in part by fully integrating a Michelson interferometer into the HH device...
May 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29709797/trident-sign-trumps-aquaporin-4-igg-elisa-in-diagnostic-value-in-a-case-of-longitudinally-extensive-transverse-myelitis
#13
Evan A Jolliffe, B Mark Keegan, Eoin P Flanagan
Longitudinally-extensive T2-hyperintense spinal cord lesions (≥3 vertebral segments) are associated with neuromyelitis optical spectrum disorder but occur with other disorders including spinal cord sarcoidosis. When linear dorsal subpial enhancement is accompanied by central cord/canal enhancement the axial post-gadolinium sequences may reveal a "trident" pattern that has previously been shown to be strongly suggestive of spinal cord sarcoidosis. We report a case in which the patient was initially diagnosed with neuromyelitis optical spectrum disorder, but where the "trident" sign ultimately led to the correct diagnosis of spinal cord sarcoidosis...
April 21, 2018: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/29691920/schlemm-s-canal-and-trabecular-meshwork-morphology-in-high-myopia
#14
Zhiqi Chen, Yinwei Song, Mu Li, Wei Chen, Shiliang Liu, Zhen Cai, Liugui Chen, Yan Xiang, Hong Zhang, Junming Wang
PURPOSE: Myopes have a higher risk for open-angle glaucoma; however, the reason is not clear. This study aims to explore the morphologic alterations of Schlemm's canal and trabecular meshwork size in highly myopic eyes. METHODS: Forty myopic eyes from 40 patients with high myopia and 40 control eyes from 40 subjects with low myopia, emmetropia or low hyperopia were enrolled. Optical coherence tomography (OCT) was used to image Schlemm's canal and trabecular meshwork size...
May 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29674379/relative-position-of-the-atrioventricular-canal-determines-the-electrical-activation-of-developing-reptile-ventricles
#15
Martina Gregorovicova, David Sedmera, Bjarke Jensen
Squamate reptiles appear to lack the specialized His/Purkinje system that enables the cardiac ventricle to be activated from apex to base as in mammals and birds. Instead, activation may simply spread from where the atrioventricular canal connects to the base. Gja5 , which encodes Cx40 that allows fast impulse propagation, was expressed throughout the ventricles of developing anole lizards. Activation was optically recorded in developing corn snake and central bearded dragon. Early embryonic ventricles were broad in shape, and activation propagated from the base to the right...
April 19, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29659172/optic-disc-drusen-understanding-an-old-problem-from-a-new-perspective
#16
REVIEW
Steffen Hamann, Lasse Malmqvist, Fiona Costello
Optic disc drusen (ODD) are acellular deposits located in the optic nerve head of up to 2.4% of the population. They may develop as by-products of impaired axonal metabolism in genetically predisposed individuals, in whom a narrow scleral canal is hypothesized to play a role. Although ODD are often considered as benign innocent bystanders, recognized as part of a routine ophthalmological examination, the vast majority of patients with ODD have visual field defects. Optic disc drusen (ODD)-associated complications with severe visual loss, most often due to anterior ischaemic optic neuropathy, are also known to occur...
April 16, 2018: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29628302/separation-patterns-of-orbital-wall-and-risk-of-optic-canal-injury-in-le-fort-3-osteotomy
#17
Niyazi Aizezi, Tomohisa Nagasao, Tadaaki Morotomi, Motoki Tamai, Koji Imajo
PURPOSE: The authors hypothesized that the risks of optic canal injury in down-fracturing after Le Fort 3 osteotomy vary depending on the separation patterns of the orbital walls. This study verifies this hypothesis using biomechanical simulation. METHODS: Ten finite-element skull models were produced using computer tomography data from ten persons. These models were modified to simulate Le Fort 3 osteotomy models by removing junctions between the neurocranium and facial cranium...
May 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29621890/biomechanical-analysis-of-likelihood-of-optic-canal-damage-in-peri-orbital-fracture
#18
Tomohisa Nagasao, Tadaaki Morotomi, Motone Kuriyama, Motoki Tamai, Yoshiaki Sakamoto, Naoki Takano
PURPOSE: Detection of optic canal fractures is often difficult because of the subtleness of the fracture. If we could clarify impact on which region around the orbit is likely to accompany the fracture of the optic canal, the knowledge should be useful to make early diagnosis of optic canal fractures. The present study was conducted to elucidate this issue. METHODS: Ten finite element models were produced simulating the skulls of ten humans (8 males and 2 females; 43...
December 2018: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29606045/tuberculum-sellae-meningiomas-grading-scale-to-assess-surgical-outcomes-using-the-transcranial-versus-transsphenoidal-approach
#19
Stephen T Magill, Ramin A Morshed, Calixto-Hope G Lucas, Manish K Aghi, Philip V Theodosopoulos, Mitchel S Berger, Oreste de Divitiis, Domenico Solari, Paolo Cappabianca, Luigi M Cavallo, Michael W McDermott
OBJECTIVE Tuberculum sellae meningiomas (TSMs) are surgically challenging tumors that can severely impair vision. Debate exists regarding whether the transcranial (TC) or endoscopic transsphenoidal (TS) approach is best for resecting these tumors, and there are few large series comparing these approaches. METHODS A retrospective chart review was performed at 2 academic centers comparing TC and TS approaches with respect to vision, extent of resection, recurrence, and complications. The authors report surgical outcomes and propose a simple preoperative tumor grading scale that scores tumor size (1-2), optic canal invasion (0-2), and arterial encasement (0-2)...
April 2018: Neurosurgical Focus
https://www.readbyqxmd.com/read/29606042/surgical-management-of-giant-sphenoid-wing-meningiomas-encasing-major-cerebral-arteries
#20
Pierre-Olivier Champagne, Emile Lemoine, Michel W Bojanowski
OBJECTIVE Sphenoid wing meningiomas are a heterogeneous group of tumors with variable surgical risks and prognosis. Those that have grown to a very large size, encasing the major cerebral arteries, are associated with a high risk of stroke. In reviewing the authors' series of giant sphenoid wing meningiomas, the goal was to evaluate how the extent of the tumor's invasion of surrounding structures affected the ability to safely remove the tumor and restore function. METHODS The authors conducted a retrospective study of a series of giant sphenoid wing meningiomas operated on between 1996 and 2016...
April 2018: Neurosurgical Focus
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