[X-ray differential diagnosis of focal tuberculosis and peripheral lung cancer]

The paper deals with the differential diagnosis of focal tuberculosis and peripheral lung cancer. It presents data on 25 patients of whom 24 were misdiagnosed as having focal tuberculosis. The main reason for misdiagnoses was the similarity of early X-ray symptoms of the two diseases, namely, upper lobar site, increased and thickened lung pattern and focal shadows against this background. The most important differentially diagnostic criteria for the above diseases are varying optic densities of pulmonary structures at the site of involvement and different patterns of vascular changes in the lung portion with a pathological process.