A 53-year-old man on peritoneal dialysis developed a rare fungal infection caused by Quambalaria cyanescens. Doctors used a special blood test (galactomannan testing) to quickly identify it as a fungal infection rather than a bacterial one, leading to timely removal of his dialysis catheter on day 5. After treatment with antifungal medications, he recovered completely with no relapses over two years of follow-up. This case shows the importance of proper hygiene during dialysis and using advanced diagnostic tools for rare infections.