All are precancerous lesions for carcinoma of esophagus except
Achalasia
Paterson Kelly syndrome
Zenker Diveiculum
Ectodermal dysplasia
Refer Robbins page no Pg 758-9 A Zenker's diveiculum, more formally known as a hypopharyngeal diveiculum, is a pouch that can form at the junction of the hypopharynx (lower pa of the throat) and the esophagus, an area known as Killian's Triangle
G.I.T