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A 43-year-old man with AIDS presents with a four-week history of ataxia, progressive right hand weakness, and tremor. Physical examination confirms his symptoms. His CD4 cell count is 56/mm3, and serum antitoxoplasma IgG antibody titer was negative one year ago. An MRI of the head reveals a solitary 2 x 4 cm lesion in the left cerebellar hemisphere which gives a high signal intensity on T2- weighted images but does not enhance with gadolinium. No mass effect is demonstrated. The most likely diagnosis is:a. Toxoplasmosisb. A fungal abscessc. Primary CNS lymphomad. Progressive multifocal leukoencephalopathy (PML)e. A mycobacterial abscess

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