<prompt> Not a predisposing factor for Ca esophagusDiveiculaHuman papilloma virusMediastinal fibrosisCaustic ingestion  <response>: OESOPHAGEAL CARCINOMA,6 th most common carcinoma in the world, can be predisposed to dietary deficiencies, human papillomavirus infections, achalasia cardia, oesophageal webs etc.it is most commonly seen in middle third of oesophagus 50and also at lower third33 and upper third17.in the lower pa adenocarcinoma is common .in India 90are squamous carcinomas.dysphagia, regurgitation, anorexia, loss of weight, ascites, palpable left supraclavicular lymph nodes are the clinical features. Ref: SRB;s manual of surgery,5th ed, pg no805 