The clinical phenomenon of a spontaneous disappearance of an enhancing lesion on cerebral computed tomography (CCT) or magnetic resonance imaging with gadolinium (MRI) is referred to as a vanishing tumor [1]. This is a phenomenon observed in 1:60.000–1:100.000 cancer patients. [2] The differential diagnoses include primary central nervous system lymphoma (PCNSL), demyelinating disease, glioma with spontaneous regression, inflammatory disease, such as sarcoidosis, Behcets disease/angiitis with granoulomatosis and parasitic disease.

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