The radiographic and computed tomographic (CT) findings in two patients with documented inhalational anthrax resulting from bioterrorism exposure are presented. Chest radiographs demonstrated mediastinal widening, adenopathy, pleural effusions, and air-space disease. Chest CT images revealed enlarged hyperattenuating mediastinal and hilar lymph nodes and edema of mediastinal fat. Chest CT findings are helpful for making the initial diagnosis. To the authors' knowledge, the spectrum and follow-up of CT findings have not been previously described.