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Leptomeningeal involvement in sarcoidosis. A and B, Enhanced axial and coronal T1-weighted images demonstrate nodular leptomeningeal enhancement in the basilar cisterns and posterior fossa. C and D, Enhanced axial T1-weighted images in a different patient demonstrate nodular leptomeningeal enhancement along the cerebellar folia (arrows). Involvement of perivascular spaces is seen at a higher level in D (arrow).
