Figure 1

a Axial image from the initial unenhanced CT brain study showing a large heterogeneous high density lesion in the right frontal brain parenchyma consistent with an acute hematoma (asterisk) with the surrounding low density of vasogenic edema causing midline shift to the left. The presence of several smaller ring lesions (see b) combined with the clinical history led the reporting neuroradiologist to raise the possibility of intracranial mycotic aneurysms as well as cerebral abscesses. b Unenhanced axial CT brain image post-craniotomy and hematoma evacuation (note the pneumocephalus). This demonstrates one of the ring lesions in the inferior left frontal region (arrow) that was noted in the initial study. This showed rim enhancement with intravenous contrast administration (not shown), in keeping with the diagnosis of a cerebral abscess.