You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is In the shown lateral view, the GIT structure marked with arrow head is? and explain in detail?
Normal Lateral Chest Xrays: Normal Findings: - Sternum - Retrosternal space and retrocardiac space should be : clear spaces or lucent areas - Obliteration of Retrosternal space: Right Ventricular Hyperophy - Tracheal Lucency - Lucency of veebra should increase- more black- as we go from top to bottom . - Right dome of can be traced all the way anterior . - Left dome of diaphragm gets obscured by cardiac shadow . - Major fissure seen only in Right Lung - Minor fissure seen both in Right and left lung.