<prompt> Most common cause of esophageal perforation at the site of cricopharynx -SpontoneousIatrogenicTraumaticNone  <response>: Ans. is b i.e., Iatrogenic o Oesophageal perforation is of two types :Iatrogenic MCCommon site is cervical esophagus Just above the upper sphincter.Spontaneous rupturey As seen in Boerhaaves syndrome Rupture of esophagus after vomitting.Common in the lower 13 of esophagus. 