“…They can be divided into those occurring at the site of injection (mostly ulcerations and esophageal fibrosis [20]) and into those originating from injection and systemic dissemination of the sclerosant (mostly fever, bacteremia [72,76], or pulmonary side effects [32,52,71]). In prospective therapeutic clinical trials [38,47,58,73,77,78,[87][88][89]94] fatal complications ranged between 0% and 13% (median 2.5%), mostly caused by perforation of the esophagus, aspiration pneumonia, and bleeding esophageal ulcers. Although the risk of fatal complications is supposed to be lower in patients undergoing elective sclerotherapy, it has to be kept in mind that 1% to 2% of the patients may die by endoscopic prophylaxis.…”