Vasoactive mediastinal mass in an infant.

The case of a 6 week-old infant who presented with an anterior mediastinal mass that extended to the left neck is reported. During surgical dissection of the mass, the patient exhibited extreme hemodynamic instability consistent with a vasoactive tumor. The patient had a neuroblastoma with its origin in the posterior mediastinum, but with its mass effect in the anterior mediastinum and neck.