Twiglike MCA: A Not-So-Common Cerebral Vascular Anomaly

Tawk, Sammy; Mourad, C.; Halut, Marin; Yazbeck, M.A.; Abdalkader, Mohamad; Khoury, J

doi:10.3174/ng.2100015

neurograph

2021

DOI: 10.3174/ng.2100015

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Twiglike MCA: A Not-So-Common Cerebral Vascular Anomaly

Sammy Tawk¹,

C. Mourad²,

Marin Halut³

et al.

Abstract: Congenital anomalies of the MCA are rare compared with the rest of the intracranial vasculature. An aplastic MCA, known as a twiglike MCA, is the result of replacement of MCA trunk by a plexiform network of small vessels. In this report, we aim to review the radiologic features of a twiglike MCA and its differential diagnosis, helping the reader differentiate this entity from more common pathologies to avoid unnecessary further investigation.

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Expansion and contraction of the Engraulis ringens spawning area in northern Chile

Moreno

Claramunt

2022

scimar

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Many studies have considered the temporal patterns of reproduction of Engraulis ringens, but little attention has been given to the spatial patterns of reproduction (spawning areas), which have shown great variability in both location (geographical position) and extent (the area covered by positive stations), without a satisfactory explanation. Along the Chilean coast, the daily egg production method (DEPM) has been used for several years to estimate spawning biomass in the northern Chile E. ringens population, with 24 surveys being carried out from 1992 to 2020. The most fluctuating parameters estimated in the DEPM have been the location and extent of the spawning area and the average female weight. In the last few years the eggs were distributed near the coast, whereas in the first few years they showed a more oceanic distribution. The average female weight has fallen from 30 g in the 1990s to 11 g in the last few years. In the present study, we analysed the relationship of the location and extent of spawning areas with female size and abundancy in E. ringens from northern Chile. According to the results, periods of high abundancy of eggs are positively correlated with larger females that spawn in more oceanic zones and to the south, expanding the spatial egg distribution and increasing the egg density. By contrast, in years with low abundance of eggs, the spawning was located north and towards the coast, with a smaller spawning area and smaller female size.

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Expansion and contraction of the Engraulis ringens spawning area in northern Chile

Moreno

Claramunt

2022

scimar

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Twiglike MCA: A Not-So-Common Cerebral Vascular Anomaly

Cited by 1 publication

References 20 publications

Expansion and contraction of the Engraulis ringens spawning area in northern Chile

Expansion and contraction of the Engraulis ringens spawning area in northern Chile

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