FINDINGS: A space-occupying lesion with enhancing thick irregular walls and central necrotic core is seen in the left frontal lobe white matter. Marked surrounding vasogenic edema, effacement of the underlying ipsilateral lateral ventricle, and contralateral midline shift of 8 mm are noted. No other focal space-occupying lesion is seen.
CONCLUSION: Left frontal lobe ring-enhancing space-occupying lesion with mass effect, which is likely a primary brain tumor; other possible differential includes brain abscess & solitary brain metastasis.