Diagnostic Challenge: Answer.

The article presents the answer to the quiz concerning the unusual cerebral computed tomography image of a 28-year-old prison inmate with recurrent frontal headaches. It states that the weighted magnetic resonance images have shown a focal enhancing lesion with diffuse surrounding edema towards the frontal white matter. It confirms the diagnosis of cerebral toxoplasmosis through histology and polymerase chain reaction on a stereotaxic frontal biopsy.