Conduit necrosis following esophagectomy: An up-to-date literature review

Table 2 Endoscopic classification system for the findings of gastric conduit ischaemia and necrosis[12]

Grades	Findings
Grade 1	Dusky bluish-color mucosa around the anastomosis covered with tenacious metallatic-appearing mucous that cannot be easily washout off
Grade 2	Partial disruption of the anastomosis with equivocal viability of the adjacent mucosa or the normal pink mucosa margins
Grade 3	Complete circumferential breakdown of the anastomosis with normal pink mucosa margins
Grade 4	Completely necrotic black mucosa throughout the gastric conduit with the anastomosis still intact