Unique case report of a chromomycosis and Listeria in soft tissue and cerebellar abscesses after kidney transplantation
© The Author(s). 2017
Received: 12 October 2016
Accepted: 6 April 2017
Published: 20 April 2017
Chromomycosis is a rare mycotic infection encountered in tropical and subtropical regions. The disease presents as a slowly-evolving nodule that can become infected with bacteria. Here, we describe a unique association of abscesses caused by a chromomycosis and Listeria monocytogenes in a kidney transplant recipient, and didactically expose how the appropriate diagnosis was reached.
A 49-year old male originating from the Caribbean presented a scalp lesion which was surgically removed in his hometown where it was misdiagnosed as a sporotrichosis on histology, 3 years after he received a kidney transplant. He received no additional treatment and the scalp lesion healed. One year later, an abscess of each thigh due to both F. pedrosoi and L. monocytogenes was diagnosed in our institution. A contemporary asymptomatic cerebellar abscess was also found by systematic MRI. An association of amoxicillin and posaconazole allowed a complete cure of the patient without recurring to surgery. Histological slides from the scalp lesion were re-examined in our institution and we retrospectively concluded to a first localisation of the chromomycosis. We discuss the possible pathophysiology of this very unusual association.
In this case of disseminated listeriosis and chromomycosis, complete cure of the patients could be reached with oral anti-infectious treatment only.
KeywordsCase report Kidney transplantation Tropical pathology Fonsecaea Listeria Antifungal therapy
Chromoblastomycosis is a chronic fungal disease mostly localised to the skin and the subcutaneous tissue. It is caused by saprophytic black moulds (also called dematiaceous fungi) which are characterised by the presence of a melanin pigment in the cell wall . The disease is more frequent in humid tropical and subtropical regions, often in rural areas where the fungi are found in soils and plant debris [2, 3]. The fungi which is the most frequently responsible for infections in human is Fonsecaea pedrosoi, but others such as Cladophialaphora carrionii, Phialophora verrucosa, Rhinocladiella aquaspersa, F. compacta, Exophiala dermatitidis, E. jeanselmei and E. spinifera, have also been identified as pathogens for a long time, both in immunocompetent and immunocompromised hosts, such as transplant recipients [4–8].
The infection usually develops after a traumatic inoculation of the skin, the most exposed areas being the lower limbs. Farmers and people of low socioeconomic status are more likely to develop the disease . After local inoculation, the infection presents as a small papule that slowly enlarges into verrucous nodules. The lesions are generally not painful. Nodules can progress to cauliflower-like masses, and can ulcerate. Complications include secondary bacterial infection and chronic lymphedema. The fungal infection itself can spread by lymphatic or hematogenous dissemination, producing distant metastatic lesions . If not promptly diagnosed, chromoblastomycosis evolves into a chronic infection which may have several complications, such as difficulties in the therapeutic management due to extensive lesions . There is a possible association with epidermoid carcinoma of the affected skin areas .
A 49-year old male patient received a deceased donor renal allograft in our institution. He was born and raised in Haiti, immigrated in France 2 years before the kidney transplantation, but maintained regular trips to Haiti. He had a history of long-standing hypertension. His chronic kidney disease was discovered in France, when it had already reached end stage. Kidney transplantation induction therapy consisted in rabbit anti-thymocyte globulines, and one steroid pulse of 1000 mg. Maintenance immunosuppression comprised tacrolimus, mycophenolate mofetil and prednisone (20 mg daily for the first 3 months, progressively tapered to 5 mg per day at month 9 post-transplantation). The lowest serum creatinine was of 140 μmol/l. Five months after transplantation, the patient acquired diabetes mellitus which required insulin therapy.
Five years after the transplantation, while travelling to his hometown in Haiti, a tumour developed in a couple of weeks on the scalp. The tumour was surgically removed, and the histological analysis indicated a sporotrichosis. We were unable to retrieve any data about potential microbiologic culture or molecular biology analysis of the scalp lesion. The patient only brought back the histological slides that were processed in Haiti to our institution. No complementary treatment was administered and the lesion healed completely.
One year later, the patient was admitted to our institution after a 1-month stay in Haiti, because of fever and one cutaneous lesion on each thigh. There was no history of local trauma. Clinical examination revealed an erythematous area of 10 × 5 cm on each thigh. There was no crural lymphadenopathy.
Renal function was stable with a serum creatinine of 165 μmol/l. Plasma C-reactive protein was at 59 mg/L. There was neither anaemia nor leucocytosis. Diabetes was decompensated with an HbA1c at 10.5%. The day after admission, blood cultures yielded Listeria monocytogenes.
Retrospective re-evaluation in our institution of the histological slides of the scalp lesion removed in Haiti eventually disclosed an aspect of chromomycosis.
This is the first case that describes the association of a chromomycosis and a subcutaneous and haematogenous listeriosis.
As a black fungus, F. pedrosoi forms melanin, which is deposited in the cell wall and in the cytoplasmic structures . Melanin plays a role in fungal pathogenicity, as it protects the cell from destruction by phagocytes and provides resistance to microbial lysis .
Chromomycosis management usually combines medical and surgical treatments. Medical therapy consists in a long course treatment with antifungal agents. The most frequently used agents are members of the azole group, i.e. itraconazole, voriconazole and posaconazole . Another treatment option is terbinafine, which accumulates in the cutaneous tissue and showed a synergistic activity with itraconazole .
Thermotherapy or cryotherapy are effective for locally advanced disease . The fungus is hard to eradicate, and treatment duration has been described up to 126 months . Surgical treatment by local excision or debridement is indicated for extensive disease.
Immunosuppressive drugs such as steroids, mycophenolate mofetil and tacrolimus severely impair all components of immunity, including innate and adaptative immunity. Sousa Mda et al. showed that persistent infection by F. pedrosoi in mice was related to the deficiency of innate recognition of the fungus by Toll-like receptors (TLR) . Administration of TLR ligands facilitated fungal clearance . More recently, Wevers et al. showed that F. monophora could escape C-type lectin receptors on human dendritic cells . We have shown that steroids were able to suppress C-type lectin in mice . Finally, we also recently showed that calcineurin inhibitors might impair neutrophils-driven antifungal immunity . Therefore, C-type lectin suppression, TLR inhibition, and neutrophil function deficiency are part of the putative mechanisms which could favour the development of chromomycosis in drug-induced immunosuppressed patients.
Because immunosuppressive drugs directly interact with T cell activation, an altered cellular immunity may also theoretically have participated in the development of chromomycosis in transplanted recipients. Because of its facultative intracellular life, L. monocytogenes is also favoured by cellular immunity deficiency . The role of the humoral anti-fungal response is unknown, although high titters of anti-fungal antibodies have been reported in the course of severe fungal disease, followed by a decrease after effective treatment .
Listeria monocytogenes is a small Gram positive facultative anaerobic bacterium. It is found ubiquitously in soils, waters, and plants. It is very resistant to disinfection and is a food-borne pathogen. The bacterium can survive in refrigerators, is resistant to congelation and requires heat to be killed, which favours its environmental diffusion. The Centre for Disease Control in the United States estimates that Listeria is responsible for 1600 episodes of infection and 260 deaths annually . The disease is more frequent in pregnant women, new-borns, older adults and immunocompromised hosts, such as cancer patients, people living with HIV/AIDS, dialysis patients, transplant recipients, and alcoholic and diabetic patients. In immunosuppressed hosts, listeriosis frequently presents as a septicaemia with meningitis . Brain abscesses have also been described in transplant recipients [27, 28].
Cutaneous infections due to Listeria monocytogenes are rare (1), and usually due to direct inoculation from infected animals in high risk populations, such as farmers and veterinarians. In a recent review of 24 cases of cutaneous listeriosis, the most frequent risk factor was exposure to an aborted bovine foetus .
Extra-cutaneous lesions due to chromomycosis are very rare, but a few cases of cerebral abscesses, perhaps favoured by immunosuppression, have been reported [4, 30–32]. In our case, we can only speculate about the aetiology of the cerebellar lesion, as both listeriosis and chromomycosis can localize to the central nervous system. No puncture of the cerebellar abscess was performed because the patient was totally asymptomatic and because the evolution was rapidly favourable after treatment initiation. The risks of the puncture clearly outweighed the potential benefits. Even though cerebral involvement in listeriosis is much more frequent than in chromomycosis, the radiologic aspect observed in this case seemed to be slightly more compatible with a fungal lesion than with cerebral listeriosis, as the latter usually presents as multiple supratentorial microabscesses. A regional dissemination from the initial scalp fungal lesion to the cerebellum seems rather improbable because of spatial separation (the cutaneous lesion was localized at the top of the vertex) and of bone interposition with the absence of bone infection on brain MRI.
As both Listeria and chromomycosis muscle abscesses are also very rare, it is hard to determine whether primitive fungal abscesses were secondarily inoculated with Listeria during the septicemic phase, or if the pathophysiology worked the other way around.
Our case very didactically exposes the complexity of appropriate management of soft tissue abscesses in immunocompromised host. An isolated bacteriological examination of the pus would only have raised Listeria, and the anti-fungal treatment would not have been initiated. Therefore, in case of immunosuppression, it is very important to obtain bacterial, fungal and histological examination of collected samples. Similarly, without a systematic imaging of the brain, the cerebellar localisation would have been missed. As anti-fungal treatment duration is not well defined, sequential brain MRIs were part of the decision to stop treatment after one year.
Cutaneous and central nervous system infections in transplant recipients can be due to a wide range of pathogens. Standard microbiology examination and cultures, histological analysis, imaging techniques, and molecular biology tools can be combined to reach an appropriate diagnosis. No recommendation exists for the treatment of invasive chromomycosis, but prolonged triazole treatment in selected cases can be sufficient.
Human immunodeficiency virus/acquired immune deficiency syndrome
Magnetic resonance Imaging
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Availability of data and materials
All material and data described in the manuscript are available upon request to the corresponding author of the present article.
JT, NB and BB collected the data from the patient’s medical records and wrote the manuscript. SD, JR and NA followed the patient and prospectively recorded the patient’s clinical data. FC acquired the pictures of the fungi (Figs. 2 and 3). AF isolated the fungus, performed molecular biology analyses, and participated to the writing of the manuscript. All authors participated in the drafting of the manuscript and approved the final manuscript.
The authors declare that they have no competing interests.
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