A 59-year-old patient with lymphoma developed a serious fungal spine infection caused by Aspergillus nidulans, a rare mold. The infection was diagnosed using imaging, fungal cultures, and laboratory testing. The patient was successfully treated with a 6-month course of the antifungal drug voriconazole without requiring surgery. This case is notable because it represents the first successful treatment of this extremely rare infection in a cancer patient.