a form of anthrax acquired by breathing in spores of Bacillus anthracis in airborne particles less than 5 mcg. The spores are then phagocytized in lung alveoli by macrophages and carried to lymph nodes in the mediastinum where hemorrhage mediastinitis ensues. The classic radiographic finding in inhalational anthrax is a widened mediastinum on plain chest radiograph or chest CT scan. Early diagnosis of inhalational anthrax is difficult because initial symptoms are nonspecific chills, fever, muscle aches, cough. After 1-3 days, dyspnea, hypotension, high fever, and stridor become the primary symptoms. Mortality for inhalational anthrax approaches 100%, even with treatment.