CT or MRI with<unk> s having an<unk> <unk>  of contrast around a less dense center can indicate certain neurological infections, injuries, and indolent disorders
Immune status of patients is key in helping to narrow potential causative agents
Ring-enhancing lesion
Demyelination
Ingrown toenail
Radionecrosis/hematoma
Intracranial mass
Metastasis
Eponyms
Abscess 