On barium swallow which of the following will cause posterior impression

On barium swallow which of the 
following will cause posterior impression ( aiims november 2009) 
–
A. Left atrium
B. Aortic knuckle
C. Pulmonary sling
D. Aberrant right subclavian artery


Ans: D . Aberrant right subclavian artery 


Barium Swallow used to evaluate Pharynx, esophagus and gastroesopageal junction.


Different cases on barium swallow - 


ACHALASIA CARDIA 

A)Early achalasia:  no dilitation but with narrowing at GE junction

B)Late achalasia after medical treatment:  narrowing of GE junction and significant dilitation

C)End state achalasia:  dilated and “sigmoid” esophagus treatment is surgery

DIFFUSE ESOPHAGEAL SPASM  

 SQUAMOUS CELL CARCINOMA 

ADENOCARCINOMA 

CHRON'S DISEASE 

ZENKER'S DIVERTICULUM 

CANDIDEAL ESOPHAGITIS 

SCLERODERMA ESOPHAGITIS  

 THYMOMA CAUSING EXTERNAL COMPRESSION OVER ESOPHAGUS