This report presents an extremely rare case of fungal mycotic aneurysm due to Magnusiomyces capitatus in a 51-year-old immunocompromised woman. The diagnosis was based on multiple CT-scans and various samples positive for the pathogen identified by sequencing of the Internal Transcribed Spacer region. Long-term treatment using caspofungin for previous candidemia would have promoted the dissemination of this intrinsically echinocandin-resistant fungus, from colonization sites in the lung and rectal areas. Long-term suppressive antifungal treatment using voriconazole followed by posaconazole, combined with numerous surgical procedures, led to an improvement in the patient's disease. This case highlights the need to consider the overall microbiological history of a patient and to reassess antimicrobial therapy in case of non-improvement or relapse.
Keywords: Geotrichum capitatum; Magnusiomyces capitatus; Saprochaete capitata; mycotic aneurysm; rare yeast invasive infection.
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