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27 December 2016 : Case report  China (mainland)

Diagnosis and Treatment of Pythium Insidiosum Corneal Ulcer in a Chinese Child: A Case Report and Literature Review

Diagnostic / therapeutic accidents, Unusual setting of medical care, Rare disease, Educational Purpose (only if useful for a systematic review or synthesis)

Hong He1ABCDEFG, Hongshan Liu1ABC, Xiaolian Chen1CD, Jiaochan Wu1BC, Miao He2B, Xingwu Zhong12ABCG*

DOI: 10.12659/AJCR.901158

Am J Case Rep 2016; 17:982-988

Abstract

BACKGROUND: Pythium insidiosum keratitis is a rare but sight-threatening disease with a high morbidity rate. It can be misdiagnosed as fungal keratitis in clinic settings. We report a case of severe Pythium insidiosum keratitis in a Chinese child, treated with combined approaches.

CASE REPORT: A 7-year-old boy from Hainan province in the south of China developed a suppurative corneal ulcer after being in a forest. A mass of hyphae was detected by confocal imaging in vivo, fungal smear test, and histochemical examination. Treatment with Natamycin, fluconazole, and Voriconazole for 1 month was unsuccessful, and a penetrating keratoplasty with anterior vitrectomy was performed. The infection reappeared 1 day after surgery, immediately after which anterior chamber irrigation with 0.02% Fluconazole and amphotericin B solution was performed. Finally, the globe was saved and there was no further recurrent infection. A cultured mycelial organism, which was hard to identify by biomorphology, was confirmed by PCR to be Pythium insidiosum. The zoospores were observed in water environments. The imaging characteristics of P. insidiosum in confocal microscopy are described herein.

CONCLUSIONS: This is the first case of Pythium insidiosum keratitis reported in China. It can be misdiagnosed as fungal keratitis in the clinic. Improving the awareness of clinicians, promoting early diagnosis, and a multidisciplinary approach, especially early surgery, improve the prognosis.

Keywords: Corneal Ulcer, Microscopy, Confocal, Oomycetes, Pythium

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923