<prompt> Signet ring appearance on CT is seen inBronchitisEmplysemaBronchiectasisBronchogenic Carcinoma  <response>: Bronchiectasis may result from an infection or medical condition, such as pneumonia or cystic fibrosis. Mucus builds up and breeds bacteria, causing frequent infections.Symptoms include a daily cough that occurs over months or years and daily production of large amounts of phlegm.Treatment may include physiotherapy and medication, such as antibiotics and drugs to help loosen mucus. 