EURORAD ESR

Case 1610

Occipital dermoid cyst with a dermal sinus

Author(s)
R. Puy, M. Avila, J. Blanch, J. Ribó, M. Medina*
 
Patient
male, 5 year(s)
 
 
  • Figure 1
    CT scan
     

    Non-contrast CT scan shows a well-delineated low-density lesion in the midline posterior fossa, without focal oedema.

     
    Area of Interest: unknown; Imaging Technique: CT scan;

    Contrast-enhanced CT scan shows a low-density nonenhancing posterior fossa mass.

     
    Area of Interest: unknown; Imaging Technique: CT scan;
     
     
  • Figure 2
    CT scan
     

    Axial CT (bone window) shows the dermal sinus tract between the middle occipital bone.

     
    Area of Interest: unknown; Imaging Technique: CT scan;

    Axial CT (bone window) shows the dermal sinus tract between the middle occipital bone.

     
    Area of Interest: unknown; Imaging Technique: CT scan;
     
     
  • Figure 3
    MRI
     

    Sagittal T1-weighted image shows an extra-axial midline cerebellar mass, displacing the vermis anteriorly. The mass shows heterogeneous signal with focal slightly hyperintense areas. There was also a small swelling in...

     
    Area of Interest: unknown; Imaging Technique: MRI;

    Axial T2-weighted image shows the posterior fossa mass, hyperintense, suggesting in this case a low lipid content.

     
    Area of Interest: unknown; Imaging Technique: MRI;
     
     
  • Figure 4
    Microscopic findings
     

    Dermal sinus cavity surrounded by granulation tissue and oedema.

     
    Area of Interest: unknown; Imaging Technique: Microscopic findings;

    The wall of the dermoid cyst, with squamous epithelium in the outer layer, and abundant keratin in the cavity.

     
    Area of Interest: unknown; Imaging Technique: Microscopic findings;
     
     
Non-contrast CT scan shows a well-delineated low-density lesion in the midline posterior fossa, without focal oedema.
 
Contrast-enhanced CT scan shows a low-density nonenhancing posterior fossa mass.
 
Axial CT (bone window) shows the dermal sinus tract between the middle occipital bone.
 
Axial CT (bone window) shows the dermal sinus tract between the middle occipital bone.
 
Sagittal T1-weighted image shows an extra-axial midline cerebellar mass, displacing the vermis anteriorly. The mass shows heterogeneous signal with focal slightly hyperintense areas. There was also a small swelling in the neighbouring subcutaneous tissue.
 
Axial T2-weighted image shows the posterior fossa mass, hyperintense, suggesting in this case a low lipid content.
 
Dermal sinus cavity surrounded by granulation tissue and oedema.
 
The wall of the dermoid cyst, with squamous epithelium in the outer layer, and abundant keratin in the cavity.
 
 
 
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