Fig. 1.

A: Magnetic resonance image (MRI) of a patient with a 5.9×4.8×5.5 cm brain abscess in the left frontal lobe. The maximum perpendicular diameters (a and b) of the abscess were measured on axial MRIs and the extent in the coronal direction (c) was assessed on coronal or sagittal images. The volume of the abscess was then calculated using the formula: V=abc/2. B: The patient was managed with abscess drainage followed by parenteral antibiotic administration for 6 weeks. MRI at discharge showed a marked decrease in abscess volume and a restoration of mass effect by the abscess.