A 73-year-old Japanese man with a medical history of sarcoidosis was diagnosed with meningitis caused by an undetermined fungus. For further identification, the cerebrospinal fluid sample was analyzed for the rDNA internally transcribed spacer regions, and the fungus was identified as Irpex lacteus. I. lacteus is classified under phylum Basidiomycota and is a wood-rotting bracket mushroom. Although there is no standard treatment regimen for I. lacteus infections, amphotericin B was effective in this patient. Herein, we present, to our knowledge, the first reported case of fungal meningitis caused by I. lacteus, its treatment course, and review relevant published literature.

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