If such a tumor has extremely exophytic growth, it may result in a huge mediastinal mass without causing dysphagia.

• 当整个肿瘤几乎都向外生长时，食道胃肠道间质细胞肿瘤可以长成相当大的纵膈腔肿瘤而不造成病人吞嚥上的症状；