Figure 1From: Adult brain abscess associated with patent foramen ovale: a case reportA 53-year-old man with reported seizures was evaluated. (A) Head CT without contrast medium reveals a round left occipital mass lesion (arrow) with hyperdense margins and a hypodense center. (B) A T-2-weighted head MRI image without contrast shows a mass (arrow) with high central signal intensity, a ring of heterogeneous peripheral signal intensity similar to that of the brain parenchyma, and a surrounding area of bright signal in the white-matter tracts. (C) On the contrast-enhanced T-1-weighted head MRI image, the mass has low signal intensity centrally that suggests the presence of fluid, and is surrounded by an enhancement ring, beyond which extends an area of low signal that indicates edema.Back to article page