Web constriction is seen in which pa of esophagus, in Plummer-Vinson syndrome
Predominantly, it affects females past 40 years. Barium swallow shows a web in the postcricoid region and the same can be seen on oesophagoscopy. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 388)
Thoracic
Abdominal
Cervical
Any of the above
Oral cavity & Oesophagus