PMC6097275_01
Brain magnetic resonance imaging study with contrast demonstrates a single rim-enhancing lesion (green arrow) involving the right caudate and basal ganglia with mass effect indenting the right lateral ventricle. Lumbar puncture cytology demonstrated B-cell lymphoma.
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A brain magnetic resonance imaging study with gadolinium showed a rim-enhancing lesion involving the right caudate and basal ganglia with mass effect indenting the right lateral ventricle (Fig. 1).
Positron emission tomography study. Note the high fludeoxyglucose (FDG) avidity within the central nervous system lesion as well as uptake within lungs bilaterally (green arrows). Lumbar puncture cytology confirmed the solitary CNS lesion as HIV-associated primary CNS B-cell lymphoma, and bronchoscopy confirmed the pulmonary findings as Pneumocystis jirovecii pneumonia (PJP).
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Positron emission tomography (PET) showed strong fludeoxyglucose (FDG) avidity primarily within the CNS lesion, consistent with HIV-associated primary CNS B-cell lymphoma (Fig. 2).