A 40-year-old male with h/o progressive dysphagia for liquid has dilated esophagus on barium meal. Most likely cause is

Surgery

A 40-year-old male with h/o progressive dysphagia for liquid has dilated esophagus on barium meal. Most likely cause is

A tender swelling in submandibular triangle is mostly likely diagnosed as

In transfacial proportions, the face Is divided into how many segments:

Specific for Ankylosing spondylitis is true?