The AA. proceeded to a radiological study of the chest in two position - postero-anterior and lateral - in 69 cases of measles, during the phase of disease. 98,55% of emphysemas, 60,87% of pneumonias, 45,48% of bronchopneumonias. 18,48% of atelectasia and 7,25% of hilar enlargment were found. It was stressed the importance of the lateral position in the chest X ray, for the diagnosis of retrocardiac pneumonias and other pulmonar alterations localized in posterior segments of the basis; this lateral position is also important in the diferential diagnosis between atelectasis and pneumonia. The various forms of emphysemas, pneumonias and atelectasis are discussed. Among the 69 patients examined, 30 were inpatients with suscepted pulmonary computations. Another 39 patients were seen as out patients, because the pulmonary complications were not suspected on clinical grounds. There was no statistical difference between the groups, regarding the occurence of emphysemas, pneumonias, atelectasis and hilar enlargment. On the ether side, it was observed that there was larger incidence of bronchopneumonias in the hospitalized patients, in the age group of 1/2 to 2 years and 2 to 6 years of age.