PMC4863397_01
Magnetic resonance imaging studies showing an extra axial heterogeneous mixed solid and cystic mass at the left frontal and temporal areas. (a) Axial T1-weighted magnetic resonance imaging and (b) sagittal T1-weighted magnetic resonance imaging exhibiting a high signal intensity extra axial mass. (c) Axial T2-weighted magnetic resonance imaging and (d) coronal T2-weighted magnetic resonance imaging showing a hyposignal to isosignal mass. (e) Axial T1-weighted magnetic resonance imaging with gadolinium showing no remarkable enhancement after contrast administration. (f) In sagittal T1-weighted magnetic resonance imaging with gadolinium sellar and suprasellar region appear normal
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F1
T1, and hyposignal to isosignal T2 was noted inside the lesion. There was no remarkable enhancement after the contrast administration [Figure 1].
After removal of the bony flap, we saw extradural cystic lesions contain dark gray opaque fluid
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F2
There were 2 extradural cystic lesions contain dark gray opaque fluid [Figure 2].
Pathological light microscopy analysis of the lesions shows cystic areas covered by squamous and basaloid epithelium that contain homogenous eosinophilic contents. In some parts of cyst walls, there were infiltration of inflammatory cells, cholesterol cleft formation and calcification (H and E, x200)
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F3
In some parts of cyst walls, there were infiltration of inflammatory cells, cholesterol cleft formation, and calcification [Figure 3].