EURORAD ESR

Case 13852

Posterior fossa arachnoid cyst

Author(s)
Samar Hamid, Shumaila Arooj

Department of Radiology,
Jinnah Postgraduate Medical Center,
Karachi, Pakistan
Email:samarjawad@hotmail.com
 
Patient
female, 18 year(s)
 
 
  • Figure 1
    Axial T1W image

    A large well-defined well circumscribed midline infratentorial cystic lesion appearing hypointense on T1W image.

     
    Area of Interest: Head and neck; Imaging Technique: MR; Procedure: Imaging sequences; Special Focus: Cysts;
     
     
  • Figure 2
    Axial T2W image

    Lesion appears brightly hyperintense on T2W image.

     
    Area of Interest: Head and neck; Imaging Technique: MR; Procedure: Imaging sequences; Special Focus: Cysts;
     
     
  • Figure 3
    Sagittal T1W post-contrast image

    An extra axial CSF intensity mass lesion not enhancing on T1W postcontrast images. Anteriorly, it causes mass effect over the brainstem and 4th ventricle resulting in hydrocephalus.

     
    Area of Interest: Head and neck; Imaging Technique: MR; Procedure: Imaging sequences; Special Focus: Cysts;
     
     
  • Figure 4
    Axial DW1 image

    No restriction seen on diffusion-weighted images.

     
    Area of Interest: Head and neck; Imaging Technique: MR; Procedure: Imaging sequences; Special Focus: Cysts;
     
     
  • Figure 5
    Axial ADC image

    The lesion appears hyperintense on corresponding ADC mapping representing no restriction to diffusion.

     
    Area of Interest: Head and neck; Imaging Technique: MR; Procedure: Imaging sequences; Special Focus: Cysts;
     
     
A large well-defined well circumscribed midline infratentorial cystic lesion appearing hypointense on T1W image.
 
Lesion appears brightly hyperintense on T2W image.
 
An extra axial CSF intensity mass lesion not enhancing on T1W postcontrast images. Anteriorly, it causes mass effect over the brainstem and 4th ventricle resulting in hydrocephalus.
 
No restriction seen on diffusion-weighted images.
 
The lesion appears hyperintense on corresponding ADC mapping representing no restriction to diffusion.
 
 
 
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