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Indefinite Integrals01:25

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The water inflow rate into a storage tank is not constant but increases over time. Initially, the pump delivers water at a rate of 5 L/min. However, the inflow rate increases by 2 L/min for each additional minute due to rising pressure or system adjustments. This scenario can be described mathematically by a linear function:It is necessary to integrate the inflow rate function to measure the total volume of water added to the tank over time. The total water volume V(t) is obtained by performing...
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Updated: May 3, 2026

Cannula Implantation into the Cisterna Magna of Rodents
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Isolated Mega Cisterna Magna: A Preliminary Study from Eastern Iran.

Masoud Pishjoo1, Mohammad Safdari2, Zohre Safdari3

  • 1Department of Neurosurgery, Shohada Hospital, Ghaen, South Khorasan, Iran.

Asian Journal of Neurosurgery
|June 9, 2025
PubMed
Summary
This summary is machine-generated.

Mega cisterna magna (MCM) is a common finding. This study found isolated MCM in 92 patients without psychiatric issues, with no significant age correlation but gender differences in diameter, and "huge MCM" only in men.

Keywords:
computed tomography scanmega cisterna magnanormal populationnormal variationpreliminary study

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Area of Science:

  • Neuroimaging
  • Anatomy
  • Radiology

Background:

  • Isolated mega cisterna magna (MCM) is a condition with debated clinical significance.
  • Previous research has linked MCM to psychiatric disorders, but its incidence in non-psychiatric populations is less understood.
  • This study focuses on MCM in patients without psychiatric comorbidities, examining its relationship with age and gender.

Purpose of the Study:

  • To determine the incidence of isolated mega cisterna magna (MCM) in a non-psychiatric patient cohort.
  • To investigate the relationship between MCM dimensions, patient age, and gender.
  • To identify potential clinical relevance of isolated MCM.

Main Methods:

  • Retrospective review of 1,016 CT scans from patients aged 1-80 with minor head trauma, headache, or vertigo.
  • Measurement of two perpendicular diameters (D1: anteroposterior, D2: transverse) of the MCM.
  • Definition of "huge MCM" as D1 > 20 mm; analysis of correlations between age, gender, and MCM dimensions.

Main Results:

  • 92 cases of MCM were identified, with a mean age of 35.31 years; no significant age-MCM relationship was found.
  • While D1 showed no gender difference, D2 was significantly larger in men than women (p < 0.029).
  • "Huge MCM" (D1 > 20 mm) was exclusively observed in 18 men (p < 0.035); no correlation between D1 and D2.

Conclusions:

  • Isolated mega cisterna magna (MCM) appears to be a normal anatomical variation with no apparent clinical significance in the general population.
  • The study highlights gender-specific differences in MCM transverse diameter (D2) and the exclusive occurrence of "huge MCM" in men.
  • Further research is warranted to explore potential correlations between isolated MCM and cognitive functions, despite the current findings suggesting no clinical relevance.