男性,因突发呕血、右上腹痛、不能进食2天。CT示十二指肠水平段内5cm×3cm占位,其CT值-30HU,有不均匀点状钙化,增强扫描无强化,最可能的诊断是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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