Corneal biopsy for diagnosis of recalcitrant microbial keratitis

  • Dana Robaei
  • U-Teng Chan
  • Pauline Khoo
  • Svetlana Cherepanoff
  • Yi-Chiao Li
  • Jane Hanrahan
  • Stephanie Watson
Cornea

Abstract

Purpose

To document the findings of corneal biopsies for progressive microbial keratitis in a large tertiary referral institution.

Methods

A retrospective medical records review of all patients who underwent at least one corneal biopsy for the diagnosis of microbial keratitis at Sydney Eye Hospital, Australia between January 1, 2010 and December 31, 2016 was performed.

Results

Thirty-eight patients (18 men and 20 women) underwent a corneal biopsy for progressive microbial keratitis unresponsive to broad-spectrum topical antimicrobials. Risk factors for microbial keratitis included contact lens wear in 8 (21%), recent intraocular surgery in 5 cases (13%), recent agricultural trauma in 3 cases (8%), exposure keratopathy due to Graves’ orbitopathy in 1 case (3%), and profound systemic immunosuppression due to chemotherapy for leukaemia in 1 case (3%). The remaining 20 patients had no identifiable risk factors. Fifteen patients (39%) had a positive biopsy result, which identified bacteria in 6 cases and Mycobacteria in 1 case, both by culture of the biopsy specimen. Three cases of fungus were identified on culture of biopsy specimen, two of which were also confirmed on histopathology and an additional case was identified from histopathology alone. A single case of Acanthamoeba was diagnosed by culture and histopathology, and an additional 3 cases were diagnosed on histopathology alone. A corneal biopsy yielded new organisms in 73% (11/15) cases where the culture results of biopsy specimens were positive.

Conclusion

Corneal biopsy is an important tool in the diagnosis of progressive keratitis, often identifying causal organisms not found on corneal scraping alone.

Keywords

Microbial keratitis Corneal biopsy Microbiology Fungal keratitis 

Notes

Acknowledgements

Dr. Nicole Carnt and Richard Rawson provided assistance to this project.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (place name of institute/committee) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Save Sight InstituteUniversity of SydneySydneyAustralia
  2. 2.Department of OphthalmologyWestmead HospitalSydneyAustralia
  3. 3.Department of Anatomical PathologySt Vincent’s HospitalDarlinghurstAustralia
  4. 4.SEALS Department of MicrobiologyPrince of Wales HospitalRandwickAustralia
  5. 5.School of Medical Sciences, Faculty of MedicineUniversity of New South WalesRandwickAustralia
  6. 6.Sydney Eye HospitalSydneyAustralia

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