An elderly woman developed a rare fungal infection in her abdominal surgical wound after surgery for a perforated colon. The infection was caused by Aspergillus welwitschiae, a mold that was initially thought to be a more common species. Doctors treated the infection by surgically removing the infected tissue and giving the patient an antifungal medication called voriconazole. This is the first reported case of this particular mold causing this type of surgical infection.