Though a central mass representing metastases to hilar or mediastinal lymph nodes is a most typical roentgenographic finding, other rare circnmstances may occur.

• 电脑断层的表现大部份以中央型病灶转移至肺门或纵隔腔为常见，甚至只见有纵隔腔淋巴结肿大而无肺部病灶，但其它少见的型态也会发生。