Open Forum Infect Dis. 2021 Aug 29;8(8):ofab392. doi: 10.1093/ofid/ofab392. eCollection 2021 Aug.
Aspergillus lentulus is a drug-resistant species that is phenotypically similar to A. fumigatus. It was discovered as a cause of azole-breakthrough disease, consistent with in vitro resistance. Clinical labs can misidentify the species as fumigatus based on phenotypic typing. We describe 4 recent cases and provide a brief review.