Follow-up MRI demonstrated a cystic structure consistent with a posterior mediastinal cystic hygroma and was atypical for both a neurenteric cyst and a duplication cyst.

• 进一步的MRI检查显示符合后纵隔水囊状淋巴管瘤的囊状结构和不典型的神经管原肠囊肿及重复性囊肿。