<prompt> Mid esophageal diveicula is classically caused by:Congenetal defectEsophageal squamous cell carcinomaTuberculosisTrauma  <response>: Mid-esophageal diveicula caused by traction from adjacent inflammation classically tuberculosis. They are true diveicula involving all layers of the esophageal wall. Reference: Harrisons Principles of Internal Medicine, 18th Edition 