<prompt> All are Precancerous for carcinoma esophagus ExceptAchalasiaPaterson-Brown-Kelly syndromeZenkers diveiculumEctodermal dysplasia  <response>: .Aetiology of CARCINOMA OESOPHAGUS includes, Diet, deficiencies Vit. A, C, Riboflavin Mycotoxin Alcohol and tobacco Common in men Fungal contamination of food Common in China - Henan province Achalasia cardia In India, common in Oesophageal webs Orissa and Karnataka Barretts oesophagus Plummer -Vinsons syndrome Corrosive strictures Tylosis Nitrosamines Ref: SRB;s manual of surgery,3 rd ed, pg no 751 