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RATIONALE In the field of natural products, dereplication of complex mixtures hasbecomes usual practice to annotate known compounds and avoid their re-isolation. To this purpose, many groups rely on liquid chromatography coupled to high resolution mass spectrometry to deduce molecular formulae of compounds allowing comparison with public or in-house databases. Electrospray ionisation is usually considered as the method of choice to investigate a large panel of compounds but, in some cases, it may lead to unusual results as described in th

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Adequate medical treatment involves sphenoid resection associated with tumor within clear margins. If adjacent body organs may take place, en bloc resection could be the treatment of choice. CASE REPORT A 62-year-old male client presented to the crisis division complaining of melena for 7 days. He underwent gastroscopy, colonoscopy and abdominal calculated tomography scan, which revealed a sizable, exophytic, lobular mass (12.6×9.7×12 cm) for the higher curvature of the b