Imaging in a rare case of cerebral phaeohyphomycosis caused by Cladophialophora bantiana in a renal transplant patient: a case report and the literature review

Abstract

Abstract Background Cerebral phaeohyphomycosis is a rare and potentially life-threatening fungal infection caused by dematiaceous fungi (Nosanchuk and Casadevall in Antimicrob Agents Chemother 50(11):3519–3528, 2006). It may occur in both immunocompetent and immunodeficient individuals, with a relatively higher incidence in the former (Revankar SG et al. in J Trop Med Hyg 38(1):206–222, 2004). A search of the Pubmed and Google Scholar databases revealed seven cases of cerebral phaeohyphomycosis in renal transplant patients caused by Cladophialophora bantiana (C. bantiana). Case presentation A 35-year-old male patient who had undergone a renal transplant presented with fever, imbalance while walking, and focal seizures involving the right lower limb. Magnetic Resonance Imaging (MRI) of the brain showed two lesions in the cerebral hemispheres. Craniotomy with excision of the lesion was done. The Periodic Acid Schiff (PAS) stain and the tissue culture on the Sabouraud dextrose agar suggested C. bantiana. The broad-spectrum antifungal drugs were started. However, the patient deteriorated in the subsequent follow-ups and eventually died of the disease. Conclusions We present a detailed report on the imaging characteristics of a rare fungal brain abscess caused by C. bantiana, which is the first case of its kind (refer to Table 1). In immunodeficient cases, intracranial pathologies can encompass a wide range of conditions, from infections to neoplasms, which often exhibit significant imaging overlap. In such a setting, the remote possibility of phaeohyphomycosis is easy to miss clinically and imaging-wise. MRI can narrow down the differential diagnosis and raise suspicion. In every suspicious case, it is of the utmost importance to correlate with the histopathology and the culture reports to initiate the prompt targeted therapy and avoid a fatal outcome. Complete excision of the abscess and antifungal agents like Voriconazole and Posaconazole are the mainstay of management in these patients.

Keywords

• Cerebral phaeohyphomycosis
• Renal transplant
• Cladophialophora bantiana
• Concentric target appearance