valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has... more valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has become part of the standard second-trimester anatomic survey. 1 These abnormalities are associated with a diverse prognostic range. A Dandy-Walker malformation represents the more severe end of the spectrum compared to milder forms such as isolated inferior vermian hypoplasia, a Blake pouch cyst, and mega cisterna magna. In cases with suspected abnormalities, a detailed multiplanar sonographic study may distinguish among these conditions and normal variants. 2 Most experts agree that cerebellar lesions can be diagnosed with a high level of accuracy only after 18 to 24 weeks' gestation. 3,4 We report 2 cases in which first-trimester evaluation revealed an abnormal appearance of the posterior fossa with markedly enlarged measurements of the intracranial translucency and brain stem-tooccipital bone diameter. These findings were thought to represent an abnormally large fourth ventricle-cisterna magna complex, raising the suspicion of a posterior fossa malformation. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia with complete agenesis of the corpus callosum in the other were established at 21 and 23 weeks' gestation. Finally, these diagnoses were confirmed by either postmortem autopsy or postnatal magnetic resonance imaging (MRI). These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, either by simple visual
... Los restos óseos presentan marcas de corte realizadas con herramientas de piedra, y están muy... more ... Los restos óseos presentan marcas de corte realizadas con herramientas de piedra, y están muy bien conservados por haber sido eliminada de sus huesos toda la carne. ... Animales que hay que cazar de otra manera, con proyectil o lanzando piedras a distancia. ...
Los procesos de cambio gestados en la 2da. Mitad del Siglo XX en el continente Europeo, en el cam... more Los procesos de cambio gestados en la 2da. Mitad del Siglo XX en el continente Europeo, en el campo de las ciencias sociales, el arte, y las investigaciones científicas, se reflejaron en el ámbito académico de las universidades latinoamericanas. La apropiación de las nuevas ...
valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has... more valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has become part of the standard second-trimester anatomic survey. 1 These abnormalities are associated with a diverse prognostic range. A Dandy-Walker malformation represents the more severe end of the spectrum compared to milder forms such as isolated inferior vermian hypoplasia, a Blake pouch cyst, and mega cisterna magna. In cases with suspected abnormalities, a detailed multiplanar sonographic study may distinguish among these conditions and normal variants. Most experts agree that cerebellar lesions can be diagnosed with a high level of accuracy only after 18 to 24 weeks' gestation. We report 2 cases in which first-trimester evaluation revealed an abnormal appearance of the posterior fossa with markedly enlarged measurements of the intracranial translucency and brain stem-tooccipital bone diameter. These findings were thought to represent an abnormally large fourth ventricle-cisterna magna complex, raising the suspicion of a posterior fossa malformation. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia with complete agenesis of the corpus callosum in the other were established at 21 and 23 weeks' gestation. Finally, these diagnoses were confirmed by either postmortem autopsy or postnatal magnetic resonance imaging (MRI). These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, either by simple visual We report 2 cases in which first-trimester measurements of the intracranial translucency and the brain stem-to-occipital bone diameter were markedly enlarged. This finding was thought to represent an abnormal fourth ventricle-cisterna magna complex. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia in the other were established and confirmed by either postmortem autopsy or postnatal magnetic resonance imaging. These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, by measuring the intracranial translucency or brain stem-to-occipital bone diameter may identify some cases with structural malformations of the cerebellum as early as the first trimester.
valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has... more valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has become part of the standard second-trimester anatomic survey. 1 These abnormalities are associated with a diverse prognostic range. A Dandy-Walker malformation represents the more severe end of the spectrum compared to milder forms such as isolated inferior vermian hypoplasia, a Blake pouch cyst, and mega cisterna magna. In cases with suspected abnormalities, a detailed multiplanar sonographic study may distinguish among these conditions and normal variants. 2 Most experts agree that cerebellar lesions can be diagnosed with a high level of accuracy only after 18 to 24 weeks' gestation. 3,4 We report 2 cases in which first-trimester evaluation revealed an abnormal appearance of the posterior fossa with markedly enlarged measurements of the intracranial translucency and brain stem-tooccipital bone diameter. These findings were thought to represent an abnormally large fourth ventricle-cisterna magna complex, raising the suspicion of a posterior fossa malformation. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia with complete agenesis of the corpus callosum in the other were established at 21 and 23 weeks' gestation. Finally, these diagnoses were confirmed by either postmortem autopsy or postnatal magnetic resonance imaging (MRI). These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, either by simple visual
... Los restos óseos presentan marcas de corte realizadas con herramientas de piedra, y están muy... more ... Los restos óseos presentan marcas de corte realizadas con herramientas de piedra, y están muy bien conservados por haber sido eliminada de sus huesos toda la carne. ... Animales que hay que cazar de otra manera, con proyectil o lanzando piedras a distancia. ...
Los procesos de cambio gestados en la 2da. Mitad del Siglo XX en el continente Europeo, en el cam... more Los procesos de cambio gestados en la 2da. Mitad del Siglo XX en el continente Europeo, en el campo de las ciencias sociales, el arte, y las investigaciones científicas, se reflejaron en el ámbito académico de las universidades latinoamericanas. La apropiación de las nuevas ...
valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has... more valuation of the posterior fossa (cisterna magna and cerebellum) for congenital malformations has become part of the standard second-trimester anatomic survey. 1 These abnormalities are associated with a diverse prognostic range. A Dandy-Walker malformation represents the more severe end of the spectrum compared to milder forms such as isolated inferior vermian hypoplasia, a Blake pouch cyst, and mega cisterna magna. In cases with suspected abnormalities, a detailed multiplanar sonographic study may distinguish among these conditions and normal variants. Most experts agree that cerebellar lesions can be diagnosed with a high level of accuracy only after 18 to 24 weeks' gestation. We report 2 cases in which first-trimester evaluation revealed an abnormal appearance of the posterior fossa with markedly enlarged measurements of the intracranial translucency and brain stem-tooccipital bone diameter. These findings were thought to represent an abnormally large fourth ventricle-cisterna magna complex, raising the suspicion of a posterior fossa malformation. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia with complete agenesis of the corpus callosum in the other were established at 21 and 23 weeks' gestation. Finally, these diagnoses were confirmed by either postmortem autopsy or postnatal magnetic resonance imaging (MRI). These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, either by simple visual We report 2 cases in which first-trimester measurements of the intracranial translucency and the brain stem-to-occipital bone diameter were markedly enlarged. This finding was thought to represent an abnormal fourth ventricle-cisterna magna complex. Subsequently, the diagnoses of a Dandy-Walker malformation with partial vermian agenesis in 1 case and inferior vermian hypoplasia in the other were established and confirmed by either postmortem autopsy or postnatal magnetic resonance imaging. These cases suggest that evaluation of the fourth ventricle-cisterna magna complex, by measuring the intracranial translucency or brain stem-to-occipital bone diameter may identify some cases with structural malformations of the cerebellum as early as the first trimester.
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