A Case of Onychomycosis which was Caused by Exophiala JeanselmeiCorrespondence Address :
Dr. Anuradha Sharma Assistant Professor, Department of Microbiology, Indira Gandhi Medical College, Shimla, (HP), India - 171001. Phone/Fax: 91 177 2883312; 919418042563 E-mail: firstname.lastname@example.org
Exophiala jeanselmei is a dematiaceous fungus which is associated with cutaneous, subcutaneous and invasive diseases. Only 2 cases of nail involvement with this fungus have been reported in the literature till now. We are reporting here another case of onychomycosis which was caused by Exophiala jeanselmei.
Exophiala jeanselmei, Onychomycosis, Sub-Himalayan region
Anuradha Sharma , Smriti Chauhan, Puneet Gupta, Ramesh Chand Guleriaimprovement. A CASE OF ONYCHOMYCOSIS WHICH WAS CAUSED BY EXOPHIALA JEANSELMEI. Journal of Clinical and Diagnostic Research [serial online] 2012 August [cited: 2018 Mar 17 ]; 6:1081-1082. Available from
Onychomycosis is a common nail disorder which is caused by dermatophytes, yeasts and non-dermatophyte molds (1). In 90% of the cases, anthropophilic dermatophytes are the causative agents (2). Exophiala jeanselmei causes mycetoma and phaeohyphomycosis, whereas chromoblastomycosis like infections have only rarely been reported (3). We are reporting here a case of onychomycosis which was caused by Exophiala jeanselmei. Till now, only two such cases have been reported (4),(5).
A 50-year old male patient presented with black discolouration and hyperkeratosis of his right great toenail which had a history of 5 years (Table/Fig 1). There was no history of trauma. All the other nails of his feet and hands appeared to be normal. There was no history which was suggestive of immunosuppression or any other chronic disease. The patient had no other complaints. The patient had received treatment for onychomycosis with griseofulvin for 6 months without any improvement before he was advised to get a fungal culture done.
Scrapings from the nail were collected and they were examined under a KOH mount. Dark coloured, septate hyphae were present on direct examination (Table/Fig 2). The culture was done on Sabouraud’s Dextrose Agar (SDA) with and without cycloheximide at 25°C and 37°C. Growth was observed by the end of 1 week at 25ºC and it was slow at 37ºC. In the young culture, yeast like budding cells which were light brown in colour were seen and the texture of the colonies was membranous. By the end of 2 weeks, the colonies were found to have become dark brown to black and velvety with a black reverse. Their growth was sensitive to cycloheximide. Microscopically, the hyphae were brown and septate and they produced branched and unbranched conidiophores laterally and at the apex. The conidiogenous cells were brown and cylindrical with annellations which were produced at the tip of the tapering conidiophores. The conidia were oval (1-3×2-5μ) and they were gathered at the tip and the sides of the conidiophores and at points along the hyphae (Table/Fig 3) (3),(6). The culture was identified as that of Exophiala jeanselmei. A repeat culture of the nail scrapings which was done after one week was also positive. The patient was treated with itraconazole and he showed clinical improvement. The lesion turned culture negative after one month of the treatment.
Onychomycosis is most commonly caused by dermatophytes, the most common isolate being Trichophyton rubrum (1). Non-dermatophyte molds and yeasts are being increasingly recognized as pathogens in nail infections. The diagnosis is made by the clinical presentation, KOH preprations and the culture of the samples (7).The toenails are more often affected than the fingernails in a ratio of about 4:1 and it is difficult to treat them successfully (2). Among the non-dermatophyte molds, Scopulariopsis brevicaulis is the most common one, which usually infects the great toenails (8).To distinguish their colonization from their infection, their repeated isolation and the presence of hyphae in the nails help in their confirmation (2),(8).
Garg et al., (9) in their study on 90 patients with onychomycosis from central India, reported Trichophyton rubrum (23.07%) to be the most common aetiologic agent, followed by T. verrucosum (2.22%) and Epidermophyton floccosum (1.11%).
Garsaud et al., (4) reported the first case of onychomycosis which was caused by Exophiala jeanselmei in 2002 in a 60-year old man. This patient was a renal transplant recipient and he had been treated with prednisone and azathioprine. The nails of his two thumbs and his two big toes had been involved for a duration of 4 years.
Another case of a 39-year old woman was reported by Oudaina et al., (5) in 2009. Her right big toe nail was involved for a duration of two years. E. jeanselmei was isolated from the cultures of the repeated samplings from the pathologic nail. The isolate was resistant to fluconazole. The treatment was given for one year, with no improvement.
There are few reports on the occasional isolation of E. jeanselmei in the Indian literature. It survives and proliferates better in relatively arid areas with a short rainy season (10). Our case belonged to the sub-Himalayan region with a cold climate and heavy rainfall. This fungus gets lodged in the tissues by thorn pricks which are caused by repeated minor trauma. In our case, no such history was elicited (6).
The correct diagnosis of the aetiological agent of onychomycosis can only be made by direct examination and by its repeated isolation in the culture, which should always be done whenever it is possible. The fungal agents which were never previously associated or which had been rarely associated with this condition can be responsible for causing the infection, particularly in the wake of the increasing immunosuppression among patients. In the severely neutropaenic patients, the nail infection may be followed by systemic dissemination (8). The microbiologists must therefore remain alert while reporting such cases.
Date of Submission: Jan 30, 2012
Date of Peer Review: Apr 12, 2012
Date of Acceptance: Jun 30, 2012
Date of Publishing: Aug 10, 2012
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