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Roentgenographic study of the human trachea with powdered tantalum.

Abstract Powdered tantalum proved a superior tracheographic contrast material in 10 patients with symptomatic tracheal stenosis. It permitted assessment of degree of stenosis and extent of mucosal changes above and below the lesion. Only a small volume of the highly radiopaque material is required, and risk to the patient is minimal. The particles adhere to the mucosal surfaces and are not dislodged by cough or deep respiration. No deleterious effects on the respiratory function were noted, and the material appears biologically and clinically inert. Particles were cleared from the airways within six hours in all cases.