Thallium-201 as a positive indicator for lung neoplasms: preliminary experiments.

Thallium-201 was given to 71 patients with various pulmonary diseases. Positive uptake was noted in primary malignant neoplasms and also in 6 cases of Hodgkin's lymphoma. No uptake was seen in pulmonary diseases other than active tuberculosis. A disadvantage is the high myocardial accumulation of this radionuclide which impairs proper visualization of paracardiac neoplasms.