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Celotno besedilo
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Celotno besedilo
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Prenatal diagnosis of rhombencephalosynapsis: neuroimaging features and severity of vermian anomaly
Krajden Haratz, K.; Oliveira Szejnfeld, P.; Govindaswamy, M. ...
Ultrasound in obstetrics & gynecology,
December 2021, 2021-Dec, 2021-12-00, 20211201, Letnik:
58, Številka:
6
Journal Article
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ABSTRACT
Objectives
To describe the prenatal neuroimaging spectrum of rhombencephalosynapsis (RES) and criteria for its classification according to the severity of vermian anomaly.
Methods
In this ...
multicenter retrospective study of fetuses with RES between 2002 and 2020, the medical records and brain ultrasound and magnetic resonance images were evaluated comprehensively to determine the severity of the vermian anomaly and the presence of associated brain findings. RES was classified, according to the pattern of vermian agenesis and the extent of the fusion of the hemispheres, as complete RES (complete absence of the vermis) or partial RES (further classified according to the part of the vermis that was missing and, consequently, the region of hemispheric fusion, as anterior, posterior, severe or mixed RES). Findings were compared between cases with complete and those with partial RES.
Results
Included in the study were 62 fetuses with a gestational age ranging between 12 and 37 weeks. Most had complete absence of the vermis (complete RES, 77.4% of cases), a ‘round‐shaped’ cerebellum on axial views (72.6%) and a transverse cerebellar diameter (TCD) < 3rd centile (87.1%). Among the 22.6% of cases with partial RES, 6.5% were classified as severe partial, 6.5% as partial anterior, 8.1% as partial mixed and 1.6% as partial posterior. Half of these cases presented with normal or nearly normal cerebellar morphology and 28.5% had a TCD within the normal limits. Infratentorially, the fourth ventricle was abnormal in 88.7% of cases overall, and anomalies of the midbrain and pons were frequent (93.5% and 77.4%, respectively). Ventriculomegaly was observed in 80.6% of all cases, being more severe in cases with complete RES than in those with partial RES, with high rates of parenchymal and septal disruption.
Conclusions
This study provides prenatal neuroimaging criteria for the diagnosis and classification of RES, and identification of related features, using ultrasound and magnetic resonance imaging. According to our findings, a diagnosis of RES should be considered in fetuses with a small TCD (severe cerebellar hypoplasia) and/or a round‐shaped cerebellum on axial views, during the second or third trimester, especially when associated with ventriculomegaly. Partial RES is more common than previously thought, but presents an extreme diagnostic challenge, especially in cases with normal or nearly‐normal cerebellar morphobiometric features. © 2021 International Society of Ultrasound in Obstetrics and Gynecology.
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Celotno besedilo
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25.
Experimental examinations of instrument for measurement of rectilinearity of axes of undercrane rails
Cmielewski, K; Krzeszowski, M; Kuchmister, J. (Akademia Rolnicza, Wroclaw (Poland). Katedra Geodezji i Fotogrametrii)
Zeszyty Naukowe Akademii Rolniczej we Wroclawiu. Geodezja i Urzadzenia Rolne (Poland),
(1990), Letnik:
188, Številka:
5
Journal Article
The paper presents the construction and method to use of a new type of measuring rod so-called instrument for measurements of rectilinearity of axes of undercrane rails. The authors present the ...
experimental examinations of the instrument. In compare to the hitherto applied of the measuring tome about 43 per cent. The new type of measuring rod improved greatly comfort the job of the sight carrier
več
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Naroči gradivo
26.
Investigations accuracy of one-stage measuring method of rectilinearity and span of undercrane rails
Cmielewski, K; Krzeszowski, M; Kuchmister, J. (Akademia Rolnicza, Wroclaw (Poland). Katedra Geodezji i Fotogrametrii)
Zeszyty Naukowe Akademii Rolniczej we Wroclawiu. Geodezja i Urzadzenia Rolne (Poland),
(1990), Letnik:
188, Številka:
5
Journal Article
In the experiments carried out with one-stage and two-stage measuring methods, the authors have been gained just the same accuracy. On the contrary measuring time of one-stage method diminish about ...
23 per cent to set against two-stage method
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27.
Geodetic post-realization measurements of a cover of a self-propelled spraged shutter
Krzeszowski, M; Makolski, K; Stopyra, R. (Akademia Rolnicza, Wroclaw (Poland). Katedra Geodezji i Fotogrametrii)
Zeszyty Naukowe Akademii Rolniczej we Wroclawiu. Geodezja i Urzadzenia Rolne (Poland),
(1987), Letnik:
167, Številka:
4
Journal Article
The paper presents the technology of measurements of a cover of a self-propelled spraged shutter provided for forming of power tunnel lining. The construction of the shutter, measuring procedure and ...
the method for elaborating of results are discussed. Measurements of the cover are carried out in 2 steps. First, the edge points are measured by means of the method for fitting collimation datum plane and technical levelling. Next, the medial points in nodal points of the meridionial-parallel network are observed by means of a relative method using of a suitable device. Accuracy of the measurements of cover deformations up to +- 2 mm has been achieved. (Author)
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