The anteroposterior (AP) X-ray of the abdomen is also known as KUB X-ray because the radiograph involves kidneys, ureters and bladder. X-ray of the abdomen can be done either in a supine or upright position. However, the supine position is preferred to the upright position. in this, the structures seen are the shape and size of spleen, kidney and liver. Intraabdominal calcifications, ascites, neoplasms, bowel obstruction and tumour masses are visible if present in an X-ray abdomen (AP view).