A 69-year-old Caucasian male with a past medical history remarkable for hypertension and testicular nonHodgkin's lymphoma (NHL) presented to the emergency department with a 1-week history of fatigue and new onset lower extremity edema. For the past 8 months, the patient was having a nonproductive cough. Work up by his primary care physician was negative, and the patient was switched from enalapril to losartan 1 week before presentation. The cough resolved, however, 2 days later the patient began to experience fatigue and lightheadedness that persisted despite decreasing the dose of losartan. He continued to develop lower extremity edema and was again seen by his primary care physician who noted the patient to be hypotensive. He was referred to the emergency department for evaluation.In a 69-year-old male presenting with fatigue, lower extremity edema, and hypotension, our first concern was for a cardiac process such as heart failure. The differential for his hypotension also included sepsis, adrenal insufficiency, hemorrhage, or possibly an adverse drug reaction. We suspected that his cough was secondary to the enalapril as his symptoms had resolved with discontinuation of this medication; however, we remained concerned that an underlying pulmonary process could also be present.The patient denied chest pain, orthopnea, paroxysmal nocturnal dyspnea, fever, weight loss, or night sweats. His testicular NHL was treated 16 years prior with orchiectomy and four cycles of CHOP without evidence of recurrence. In addition to losartan, the patient also took a daily aspirin. He was a retired carpenter who had a 19-pack year smoking history and had quit 37 years before presentation. He occasionally drank alcohol. He denied illicit drug use. On examination, he was not in distress. His weight was 80.2 kg. His temperature was 36.48C, pulse 130 and regular, respiratory rate 18, blood pressure 78/46, and oxygen saturation was 97% while breathing ambient air. Physical examination was remarkable for a normal jugular venous pressure, tachycardia without extra heart sounds and generalized anasarca including 2+ pitting edema of his lower extremities. There was no lymphadenopathy, palpable masses, or cutaneous lesions. His neurologic examination was normal.The patient's review of systems was negative for symptoms of an acute coronary syndrome or heart failure, as well as for B-symptoms or a rapidly progesssive infectious process. On physical examination, his vital signs suggested intravascular volume depletion with tachycardia and hypotension; however, he appeared to have a component of fluid overload or third spacing of fluids with the marked degree of anasarca. His normal jugular venous pressure suggested normal right heart pressure making a cardiac cause of his anasarca less likely.The patient's white cell count was 12,300/mm 3 , with 93% neutrophils, 1% bands, and 6% monocytes. The hemoglobin level was 11.3 g/dl, with a mean corpuscular volume of 78.8 mm 3 . The platelet count was 554,000/ mm 3 . The serum sodium level was 126 mmo...