<prompt> A most common cause of esophageal perforation at the site of cricopharynx -SpontoneousIatrogenicTraumaticNone  <response>: Oesophageal perforation is of two types : Iatrogenic MC A common site is cervical esophagus Just above the upper sphincter. Spontaneous rupture As seen in Boerhaaves syndrome Rupture of esophagus are vomiting. Common in the lower 13 of esophagus. ref - Internet 