Fig. 23.

Brain magnetic resonance imaging in a 12-year-old boy a Axial T2 demonstrates a hyperintense lesion in the pons with a hypointense rim. b, c Sagittal images show intermediate to low signal on T1 (b) with peripheral enhancement post-gadolinium (c). d Axial diffusion weighted imaging shows some restriction in the wall and content. There was corresponding low signal on apparent diffusion coefficient map (not shown). The differential for these imaging findings includes a tuberculous (TB) abscess or liquifying tuberculoma. The patient’s clinical condition deteriorated requiring drainage; surgery confirmed a TB abscess with the content teeming with TB bacilli