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Rapid Communication| Volume 115, P237-238, February 2022

Nocardial brain abscess in a patient with AIDS

  • Shih-Hao Lo
    Affiliations
    Department of Internal Medicine, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
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  • Chieh Chin
    Affiliations
    Department of Laboratory Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Taiwan
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  • Po-Liang Lu
    Affiliations
    Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Taiwan
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  • Shang-Yi Lin
    Correspondence
    Shang-Yi Lin, M.D., Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, No. 100, Tzyou 1st Road, Kaohsiung, 807, Taiwan, Tel: +886-7-3121101 ext 5675, Fax: +886-7-3228547
    Affiliations
    Department of Laboratory Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Taiwan

    Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Taiwan

    Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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Open AccessPublished:December 17, 2021DOI:https://doi.org/10.1016/j.ijid.2021.12.337

      Keywords

      A 34-year-old man with AIDS presented with progressive slurred speech and general weakness for 2 months. His CD4 count was 29 cells/µL and viral load 407 copies/mL. Physical examination revealed clear consciousness, and meningeal signs were negative. Brain magnetic resonance imaging with contrast (Figure 1) revealed multiple thick ring enhanced lesions over bilateral cerebral, cerebellar hemispheres and brain stem. The tissue was obtained via craniotomy. Gram staining revealed scattered, weak gram-positive, curved rods (Figure 2). Modified acid-fast staining showed numerous tree-like organisms (Figure 3). The tissue culture yielded Nocardia beijingensis, which was confirmed by 16S ribosomal RNA sequencing. He was treated with sulfamethoxazole/trimethoprim and returned to his work without any neurological sequelae 1 year later.
      Figure 1
      Figure 1Sagittal view of T1 fluid-attenuated inversion recovery imaging with gadolinium showing multiple ring-enhanced lesions over the bilateral cerebral and cerebellar hemispheres and brain stem
      Figure 2
      Figure 2Gram staining of the brain tissue (magnification x1000)
      Figure 3
      Figure 3Modified acid-fast staining of the brain tissue (magnification x1000)
      Central nervous system involvement occurs in more than 40% of cases of disseminated nocardiosis (
      • Corti M.E.
      • Villafane-Fioti M.F.
      'Nocardiosis: a review'.
      ). Magnetic resonance imaging frequently showed multiple cystic lesions surrounded by hypointensity on T2-weighted imaging with a multiloculated pattern after gadolinium chelate administration on T1-weighted imaging (
      • Beuret F.
      • Schmitt E.
      • Planel S.
      • Lesanne G.
      • Bracard S.
      'Subtentorial cerebral nocardiosis in immunocompetent patients: CT and MR imaging findings'.
      ). N. beijingensis was first discovered in Beijing, China, in 2001 and was rarely reported in central nervous system infection (
      • Kageyama A.
      • Poonwan N.
      • Yazawa K.
      • Mikami Y.
      • Nishimura K.
      'Nocardia beijingensis, is a pathogenic bacterium to humans: the first infectious cases in Thailand and Japan'.
      ). The nocardial brain abscess may mimic malignancy, toxoplasmosis, tuberculosis, fungal infection and cysticercosis on imaging. Urgent tissue
      proof and pathogen identification have become crucial for accurate treatment.

      Declaration of Competing Interest

      No conflict of interest to declare

      Funding source

      This report has no funding source.

      Ethical approval

      Ethical approval is not required.

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