Figure 1: Radiological evolution of acute respiratory distress syndrome (ARDS) over the first week in a 57-year-old male patient with non-Hodgkinfs lymphoma and H1N1 infection. (a) On admission, the radiography examination did not show any pathological findings. (b) The next day, some pulmonary consolidations appeared at the lower lobes. (c and d). Over the next 2-3 days, a rapid deterioration of clinical and radiological conditions occurred with consolidations (c) progressing to diffuse alveolar involvement, with gwhite lungh appearance (d). The normal-sized heart and vascular structures help in the differential diagnosis of pulmonary edema owing to heart failure.