A 45-year-old man presented with fever, progressive mutism and memory loss, was admitted to our hospital. MR imaging and angiography suggested multiple foci of infarctions and vasculitis without Gadrinium-enhancement. CSF examination revealed pleocytosis with mononuclear cell dominance and elevated protein content. Adenosine deaminase activity was accelerated, and no malignant cell was found. Whole body CT imaging and Garium-scintigraphy were normal. Under the clinical diagnosis of tuberculous meningitis, anti-tubercular drugs with steroid were administered, resulting in marked attenuation of his neurological impairments. Four months later, his symptoms aggravated and restudy of Garium-scintigraphy revealed enhanced accumulation in the submandibular and abdominal lymphnodes. A lymph node biopsy revealed diffuse large B-cell lymphoma cells. In such a case of this clinical statue, careful and repeated observations should be required to establish the correct diagnosis of occult lymphoma.
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