Herein, we present a case of a male patient with breast cancer and a recent history of COVID-19 pneumonia, diagnosed with pseudofungi on pathological examination of lymph nodes after mastectomy. Pseudofungi are septate hyphae-like structures that morphologically mimic fungal elements despite the absence of true mycosis and thus predispose to overtreatment if not properly identified. We report a review of similar cases involving this diagnostic mimicker in the literature.