<prompt> Investigation of choice for dysphagia for solidsEndoscopyX-ray chestC.T. ScanBarium swallow  <response>: History A detailed history is of paramount impoance. Asceain, if dysphagia is of: a Sudden onset: Foreign body or impaction of food on a pre-existing stricture or malignancy, neurological disorders. b Progressive: Malignancy. c Intermittent: Spasms or spasmodic episodes over an organic lesion. d More to liquids: Paralytic lesions. e More to solids and progressing even to liquids: Malignancy or stricture. f Intolerance to acid food or fruit juices: Ulcerative lesions. OesophagoscopyEndoscopic It gives direct examination of oesophageal mucosa and permits biopsy specimens. Flexible fibreoptic or rigid scopes can be used. Ref : ENT textbook by Dhingra 6th edition Pgno : 347,348 