A 3-year-old healthy child developed a serious fungal bone and joint infection in the elbow after surgery to repair a broken arm bone. The fungus, called Lomentospora prolificans, is extremely resistant to most medications and can lead to limb amputation. Doctors saved the child’s arm by combining multiple approaches: repeated surgeries to clean out infected tissue, three different antifungal medications taken together, special antibiotic-loaded bone cement placed in the elbow, and antiseptic wound washing. After six months of treatment, the infection was cured and the child could use their arm again.