A 20-month-old cat from Brazil’s Amazon region presented with nasal discharge, skin lesions, and a neck mass and was diagnosed with cryptococcosis caused by a dangerous fungus called C. deuterogattii. The cat was also infected with feline immunodeficiency virus (FIV), which weakened its immune system and made it vulnerable to the fungal infection. Treatment with the antifungal medication fluconazole successfully cured the infection within 8 weeks, and the cat made a full recovery.