A 27-year-old man was admitted to the hospital complaining of two days of increasing weakness, fatigue, and dyspnea, with a nonproductive cough and fever. Two months prior to admission he had been evaluated for fevers (39.4#{176}C)and left neck swelling. CT scans of the chest and abdomen showed cervical and supraclavicular adenopathy and a left axillary mass. No mediastinal or abdominal adenopathy was noted. Biopsy examination of a left supraclavicular lymph node revealed large cell lymphoma. He was subsequently evaluated at Stanford Hospital, and four days prior to admission had a lymphangiogram as part of a routine staging workup. The patient had no prior history of respiratory illness and had not traveled abroad. He had no risk factors for AIDS, but an HIV titer was performed on admission, which was subsequently returned as negative. On admission his temperature was 38.8#{176}C, and he was in moderate respiratory distress. He was orthostatic. His chest examination was significant for diffuse crackles with no wheezes. Palpable lymph nodes were present in both axilla and in the cervical and supraclavicular regions. Laboratory studies showed the following: WBCs, 15.4 x 10 /L, with 68 percent segmented forms, 19 percent band forms, 1 1 percent lymphocytes, and 2 percent monocytes; hematocrit, 32.7 percent; and hemoglobin, 10.9 g/dl. Four days prior to admission his hematocrit was 36 percent. Platelets were 551,000/mi, the PT, 13.9 s (control, 13 s); PTT, 33.9 s (control, 24 to 33 s). The BUN was 5 mg/dl and creatinine 0.6 mg/dl. The urinalysis was normal. Arterial blood gas while breathing with 2 L of supplemental 02 was pH 7.46; PC02, 36 mm Hg; and Po2, 106 mm Hg. Chest roentgenogram (Fig 1) showed diffuse patchy infiltrates throughout all lung fields. His therapy was begun with empiric trimethoprim/sulfamethoxazole and erythromycin. On the day following
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