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Journal Article
Autopsy case of amebic granulomatous meningoencephalitis caused by Balamuthia mandrillaris in Japan.
Pathology International 2012 June
Balamuthia mandrillaris is a free-living ameba that causes amebic encephalitis. Herein, we report an autopsy case of Balamuthia encephalitis proven with polymerase chain reaction (PCR) and immunohistochemistry from paraffin-embedded brain biopsy specimens. A 68-year-old Japanese male presented at a hospital with progressive right hemiparesis approximately 3 months before his death. An open-brain biopsy specimen showed diffuse meningitis with massive coagulative necrosis. The perivascular spaces contained numerous lymphocytes, histiocytes and giant cells, although the etiology was not determined. The patient deteriorated into coma and died from cerebral herniation. Autopsy revealed abundant trophozoites and cysts in the subarachnoid and Virchow-Robin's spaces. Electron-micrographs of the amebic cysts showed a characteristic triple-walled envelope. The amebas were identified as Balamuthia mandrillaris based on immunohistochemical analysis from the autopsy and biopsy specimens. Primer sets designed to amplify approximately 200 bp bands of mitochondrial 16S rRNA gene of Balamuthia by PCR produced positive results from the biopsy specimens but negative results from the autopsy specimens. In summary, PCR to amplify shorter segments of DNA may be of diagnostic value in detecting suspected cases of balamuthiasis in formalin-fixed, paraffin-embedded specimens. Increased awareness and timely diagnosis of Balamuthia encephalitis might lead to earlier initiation of therapy and improved outcome.
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