Extra axial enhancing lesion on MRI. The most likely diagnosis is:
After glioblastomas, meningiomas are the second most common brain tumor, and the most common extra axial tumor. Ref: Essentials of Clinical MR edited by Val Runge, John Morelli, 2010, Chapter 4
Meningioma
Ependymoma
Arachnoid cyst
Lipoma