five stages have been revealed in the ulcer development : tissue necrobiosis and necrosis ( 1-3 days ) , rejection of the necrotic masses ( 3-5 days ) , outgrowth of the connective tissue in the fundus of the ulcer ( 5-13 days ) , reduction of the connective tissue and completion of epithelization ( 13-40 days ) , the mucosal tunic formation at the place of the ulcer ( 40-137 days ) .
C0041582
ulcer
C0236053
mucosal