Left periventricular mass demonstrating a homogeneous, T2 iso- to hyperintense mass with patchy enhancement post gadolinium and prominent restricted diffusion.
An initial CT (not shown) demonstrated a homogeneously hyperdense mass.
The lack of prominent enhancement is atypical.
MR spectroscopy revealed: Large Choline peak with reversed choline:creatinine ratio. Prominent lactate peak is also seen. Prominent inositol peak is also seen.
Findings are nonetheless consistent with primary CNS lymphoma.