MRI
Axial T1
Axial T2
Axial FLAIR
Sagittal T1 C+
Axial T1 C+
Coronal T1 C+
Sagittal T2
The MRI shows a well-defined thick-walled cystic lesion in the left basal ganglia which has mild peripheral edema and associated with considerable mass effect, especially on the foramen of Monro, which causes obliteration of the left frontal horn of the lateral ventricle. After the administration of contrast medium, the mass shows thick ring-like enhancement. You can see a small projection of the mass in the medial side of it, which seems to be trying to cross the midline and creates the butterfly fashion.