Bral regions, and the posterior mediastinum as well as in tumour staging and pulmonary embolism CT and MRI are considered superior to ultra-sonography. Ultrasound is a reliable and efficient imaging method to evaluate a wide range of perplexing medical problems in the chest and to guide diagnostic and therapeutic procedures. Although the ribs, spine and air-filled lungs act as barriers to ultrasound visualization of intra-thoracic diseases, the presence of fluid in the pleural space and tumor, consolidation or atelectasis in the lung provide ample sonographic windows for evaluation .Chest ultra-sonography is considered as a reliable method for the diagnosis of chest wall, pleural, pulmonary and most of the mediastinal diseases as well as guiding interventional procedures for their subsequent management. Its lack of ionizing radiation and need of contrast, low cost, bedside availability and dynamic imaging capacity afford ultrasound certain advantages over other techniques; particularly in the critical care setting where conventional radiography is often suboptimal. On the other hand, in the aortopulmonary window, the subcarinal and paraverte