Demographics:
43 years old, Male
Indication:
Headache, history of HIV/AIDS
Findings
CT
- Ill-defined hypoattenuating areas involving the left basal ganglia, right thalamus, and bilateral internal capsule
- Internal foci of hyperattenuation
MRI
- Peripherally enhancing lesions measuring up to 2.1 cm in the right thalamus and 1.5 cm in the left lentiform nucleus
- Internal T1 signal hypointensity and mild T2/FLAIR signal hyperintensity
- Corresponding peripheral restricted diffusion, more pronounced with the right thalamic lesion
- Surrounding T2/FLAIR signal hyperintensity and local mass effect with crowding of the third ventricle
Annotated Images & Illustrations
Peripherally-enhancing lesions in the right thalamus and left lentiform nucleus (red arrows).
Peripheral restricted diffusion, more pronounced with the right thalamic lesion (red arrows).
Diagnosis
CNS toxoplasmosis
Key Imaging Features
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Differential Diagnosis
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Discussion
Pearls
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