CASE REPORTSWhite piedra of the scalp caused by Trichosporon inkin: a case report with antifungal susceptibility testing and review of the literatureFerreira, Iago Gonçalvesa,b; Koehler, Alessandrac; Ribeiro, Amanda Carvalhod; Damiani, Leandroa; Venier, Natália Andressa Bussa; Vettorato, Gersona; Scroferneker, Maria Lúciab,e Author Information aDermatology Service - Santa Casa de Misericórdia de Porto Alegre bPostgraduate program of Health Education, Universidade Federal de Ciências da Saúde de Porto Alegre cPostgraduate Program of Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul dGraduation in Pharmacy, Universidade Federal do Rio Grande do Sul eDepartment of Microbiology, Immunology and Parasitology, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. Correspondence to Maria Lúcia Scroferneker, Department of Microbiology, Immunology and Parasitology, ICBS, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite 500, 90050-170, Porto Alegre, RS, Brazil. E-mail: [email protected] Received 3 May, 2022 Accepted 4 May, 2022 Reviews and Research in Medical Microbiology 34(1):p 6-11, January 2023. | DOI: 10.1097/MRM.0000000000000318 Buy Metrics Abstract We report a case of white piedra of the scalp caused by Trichosporon inkin in a 38-year-old woman living in southern Brazil. Trichoscopic examination revealed whitish nodules involving the hair shafts. Blastoconidia clustered around the hair shaft were visualized by light microscopy with 10% KOH. The isolate was molecularly identified, and its antifungal susceptibility profile was defined following the M27-A3 protocol of the Clinical and Laboratory Standards Institute (CLSI), with itraconazole being the most effective antifungal agent, followed by ketoconazole. For treatment, topical medications were used, consisting of 1% itraconazole solution and 2% ketoconazole shampoo for 30 days. The literature on cases of white piedra of the scalp caused by T. inkin, in addition to the in vitro antifungal susceptibility profile of this species, was reviewed. Copyright © 2022 Wolters Kluwer Health, Inc. All rights reserved.