Cultures of the aspirated psoas collection grew methicillin-resistant Staphylococcus aureus. Blood cultures and transesophageal echocardiogram were negative for culture growth and valvular pathology respectively. The patient was treated with a four week course of intravenous following by an eight week course of flucloxacillan. Repeat scanning upon completion of this antibiotic course demonstrated complete resolution of the right psoas abscess.