<prompt> The basic pathology of Barretts esophagus is:Metaplasia of columnar cells to squamous cellsMetaplasia of squamous cells to columnar cellsDysplasia of EpitheliumLow pressure in Lower sphincter  <response>: Ans. b Metaplasia of squamous cells to columnar cellsRef: Bailey and Love 26th Edition, Page 1000 Metaplasia of squamous cells to intestinal type of columnar cells is Barret The biopsy shows Goblet cells: Pathognomonic. 