Thoracic cord compression caused by disk herniation in Scheuermann’s disease: A case report and review of the literature

We present the case of a 14-year-old male with Scheuermann’s disease and significant neurological deficit due to thoracic disk herniation at the apex of kyphosis. He was treated with an anterior decompression, anterior and posterior fusion in the same setting using plate, cage and a segmental instrumentation system. The patient had an excellent outcome with complete neurological recovery

Osteocondromas da coluna vertebral: um diagnóstico a considerar nas síndromes de compressão medular

Os autores realizaram revisão dos 312 casos de osteocondroma solitário e osteocondromatose múltipla, atendidos no Hospital SARAH do Aparelho Locomotor durante período de 13 anos - compreendido entre 1982 e 1994. Destes, foram selecionados seis casos de pacientes com lesão da coluna vertebral, correspondendo a 1,92% do total de casos diagnosticados desta entidade. Os casos selecionados foram submetidos a propedêutica radiológica que envolveu radiografias simples, mielografia, tomografia computadorizada e, em um dos casos, ressonância magnética. Todos foram submetidos a procedimento cirúrgico descompressivo, com retirada das lesões, as quais foram encaminhadas a análise histopatológica que confirmou a impressão diagnóstica inicial. Este estudo abrange ainda revisão dos possíveis mecanismos implicados na patogênese do processo.The authors reviewed 312 cases of solitary and multiple osteochondromas seen in SARAH Hospital for the Locomotor System during a period of 13 years - from 1982 to 1994. They selected six cases of patients with osteochondromas of the spine, corresponding to 1.92% of the total number of diagnosed cases of this entity. The selected cases were submitted to roentgenographic examination that comprised plain roentgenograms, myelography, computerized tomography and, in one of them, magnetic resonance imaging. They were submitted to decompressive surgical procedures (including laminectomy) with exeresis of the lesions and posterior histopathological examination which confirmed the initial diagnostic hypothesis. This study also includes a review of the possible mechanisms implicated in the pathogenesis of the disease

Prospects for Observing and Localizing Gravitational-Wave Transients with Advanced LIGO and Advanced Virgo.

We present a possible observing scenario for the Advanced LIGO and Advanced Virgo gravitational-wave detectors over the next decade, with the intention of providing information to the astronomy community to facilitate planning for multi-messenger astronomy with gravitational waves. We determine the expected sensitivity of the network to transient gravitational-wave signals, and study the capability of the network to determine the sky location of the source. We report our findings for gravitational-wave transients, with particular focus on gravitational-wave signals from the inspiral of binary neutron-star systems, which are considered the most promising for multi-messenger astronomy. The ability to localize the sources of the detected signals depends on the geographical distribution of the detectors and their relative sensitivity, and 90% credible regions can be as large as thousands of square degrees when only two sensitive detectors are operational. Determining the sky position of a significant fraction of detected signals to areas of 5 deg2 to 20 deg2 will require at least three detectors of sensitivity within a factor of ∼ 2 of each other and with a broad frequency bandwidth. Should the third LIGO detector be relocated to India as expected, a significant fraction of gravitational-wave signals will be localized to a few square degrees by gravitational-wave observations alone

Localization and broadband follow-up of the gravitational-wave transient GW150914

A gravitational-wave transient was identified in data recorded by the Advanced LIGO detectors on 2015 September 14. The event candidate, initially designated G184098 and later given the name GW150914, is described in detail elsewhere. By prior arrangement, preliminary estimates of the time, significance, and sky location of the event were shared with 63 teams of observers covering radio, optical, near-infrared, X-ray, and gamma-ray wavelengths with ground- and space-based facilities. In this Letter we describe the low-latency analysis of the gravitational wave data and present the sky localization of the first observed compact binary merger. We summarize the follow-up observations reported by 25 teams via private Gamma-ray Coordinates Network Circulars, giving an overview of the participating facilities, the gravitational wave sky localization coverage, the timeline and depth of the observations. As this event turned out to be a binary black hole merger, there is little expectation of a detectable electromagnetic signature. Nevertheless, this first broadband campaign to search for a counterpart of an Advanced LIGO source represents a milestone and highlights the broad capabilities of the transient astronomy community and the observing strategies that have been developed to pursue neutron star binary merger events. Detailed investigations of the electromagnetic data and results of the electromagnetic follow-up campaign will be disseminated in the papers of the individual teams