<prompt> Trachealization of oesophagus is seen in?Eosinophilic esophagusSchatzki ringGERDHerpes simplex esophagitis  <response>: The presence of multiple corrugated rings and linear furrows all through a narrowed oesophagus is called Trachealisation of oesophagusfeline oesophagus. This is seen in eosinophilic esophagitis. Histological confirmation of eosinophilic esophagitis is made with demonstration of 15 eosinophils per HPF. 