A 59-year-old man presented to the emergency department with a 1-day history of a flu-like syndrome with nausea, vertigo, thirst, low-grade fever, and myalgias. His medical history was remarkable for arterial hypertension and a follow-up for a monoclonal gammopathy of undetermined significance (MGUS [IgG type λ]). He had experienced a non-ST-elevated myocardial infarction 2 months prior to hospital admission for which he had undergone a percutaneous angioplasty with stenting of the circumflex coronary artery. His recovery was uneventful. He received therapy with perindopril, 2 mg/d; simvastatin, 40 mg/d; bisoprolol, 5 mg/d; aspirin; clopidogrel; molsidomine; and ezetimibe. He had smoked for 40 years. Family and exposure histories were noncontributory. There was no known history of allergy.