In the past twenty years ultrasound has been the subject of renewed interest in lung exploration in the broad sense. The necessity of accessing a means of rapid exploration at the bed of the patient in a critical situation has led to the development of a pleuro-pulmonary ultrasound semiology to make it a diagnostic tool of choice which exceeds the strict framework intensive care units and emergency services. With the diagnosis of thoracic tumors or the exploration of interstitial syndromes, it tends to integrate more into the daily practice of the pulmonologist. This article is a review of the possibilities offered by ultrasound in the field with its advantages and limitations.