Introduction:Pneumonia is an inflammation of the pulmonary parenchyma mainly due to an infectious process, Acute lower respiratory tract infections represent one of the main causes of morbidity and mortality in the pediatric population worldwide, so their diagnosis is of great importance for the treatment of patients; In recent years, there has been increasing evidence of the usefulness of ultrasound and chest radiography in the management of patients with pulmonary processes, among which pneumonia stands out.Methodology: A bibliographic search was carried out in databases, selecting original articles, case reports and bibliographic reviews from 2013 to 2021, using the documents that will treat Lung ultrasound vs radiography as a diagnostic method for pneumonia in pediatric patients, obtaining 21 articles for the realization of this document. Results:In 2012, a total of 102 patients with clinical suspicion of pneumonia were studied [14]; RT and EP were performed on the same day.Conducted a randomized study of diagnostic tests comparing PE and RT in patients admitted to their emergency department with a clinical suspicion of pneumonia, including a total of 191 patients aged from 0 months to 21 years of age [17]. Conclusion:Lung ultrasound has better sensitivity and specificity than chest X-ray.