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Cryptococcosis is an invasive fungal infection that is common among organ transplant recipients, and it is challenging to treat among these patients because of their immunocompromised status. Fluconazole (FLCZ) is recommended as a first-line treatment modality for pulmonary cryptococcosis in organ transplant recipients. However, cases of FLCZ resistance among Cryptococcus neoformans isolates have been reported from the Asia Pacific region. Previous studies have reported the efficacy of voriconazole (VRCZ) in patients with FLCZ-resistant fungal infections. Herein, we report a case of FLCZ-resistant pulmonary cryptococcosis after renal transplantation that was successfully treated with VRCZ combined with amphotericin B-liposome (L-AMB). The patient was a-23-year-old woman who underwent living-donor kidney transplantation at age 20 years. She has attended our hospital since before for mental retardation, epilepsy, and dilated cardiomyopathy. At age 23 years, she presented to our hospital with fever and cough. She was diagnosed with pulmonary cryptococcosis based on positive-serum cryptococcal antigen. Chest radiography showed bilateral consolidations. Fosfluconazole (F-FLCZ) was administered, and her condition improved. However, she developed cough and fever again on day 60 of hospitalization. Cryptococcosis recurrence was suspected due to the high degree of cryptococcal antigen titers showed (1:2048) taken on the same day. Therefore, L-AMB was added, and F-FLCZ was substituted with VRCZ. Her condition improved, but L-AMB was discontinued due to hyponatremia, hypokalemia, and elevated serum creatinine. This indicates that VRCZ caused the remission. She was discharged after 6 months of admission. In conclusion, this case shows the efficacy of VRCZ combined with L-AMB for refractory pulmonary cryptococcosis.

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Successful treatment with voriconazole combined with amphotericin B-liposome for fluconazole-resistant pulmonary cryptococcosis after renal transplantation