nd : yag laser vaporisation of mainly exophytic cancerous tissue is mainly indicated for those circumstances which are less amenable to prosthesis insertion such as total luminal obstruction , noncircumferential tumorous involvement , polypoid cancers , excessively necrotic and chronically bleeding tumors , lesions extending within 2 cm of the upper esophageal sphincter , markedly angulated cancers of the cardia with almost horizontal tube positioning and cancerous overgrowth occluding the funnel opening .
C0027651
tumors
C0006826
cancerous