What is the abnormality and where is it located?
There is a ring enhancing brain lesion within the left superior frontal gyrus.
What is the differential diagnosis? What mnemonic is useful here?
Differential for ring enhancing brain lesion is MAGIC DR = metastasis, abscess, glioma (GBM), infarct (subacute), contusion, demyelination and radiation necrosis.
A region of hypoattenuation is seen within the left superior frontal gyrus with a 20mm ring enhancing lesion evident on the post contrast images. Remaining intracranial appearances are unremarkable.