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Updated: Sep 15, 2025
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Differentiating mega cisterna magna from cisterna magna arachnoid cysts: The diagnostic utility of quantitative
Quanxiang Li1, Zhe Feng2, Haichao Cheng3
1Department of Radiology, TCM Hospital of Yiyuan County, Yiyuan County, Shandong, China.
Objective:
To explore the utility of diffusion-weighted imaging (DWI)-derived apparent diffusion coefficient (ADC) and exponential apparent diffusion coefficient (eADC) parameters in differentiating mega cisterna magna (MCM) from cisterna magna arachnoid cysts (CMAC).
Methods:
Retrospective analysis of MRI data from 40 MCM patients, 46 CMAC patients (confirmed via clinical follow-up and imaging criteria), and 36 temporal arachnoid cysts (TAC) as controls was performed. Independent sample t-tests were used to compare ADC and eADC values among the three groups.
Results:
The eADC values of MCM, CMAC, and TAC were (3.75 ± 0.27) × 10-2, (4.53 ± 0.54)×10-2, and (4.35 ± 0.30) ×10-2 mm2/s, respectively. There was no significant difference in the eADC value between CMAC and TAC (p = 0.191). However, the eADC value of MCM was significantly different from the two groups (p = 0.000). The ADC values of MCM, CMAC, and TAC were (3.30 ± 0.08) × 10-3, (3.11 ± 0.12) ×10-3, and (2.97 ± 0.71) × 10-3 mm2/s, respectively. Significant differences in ADC were observed between MCM and both CMAC and TAC (p = 0.000/0.003).
Conclusion:
DWI-derived ADC and eADC parameters can effectively differentiate mega cisterna magna from cisterna magna arachnoid cysts.
