Fig. 2

Preoperative computed tomography and intraoperative findings of rapid enlarged tumor in the right upper lobe. a The right upper lung lesion, especially cystic component, increased in size to 120 mm over a 7-month period. b The cystic component of the tumor, which had a dark-red surface, occupied most right upper lobe volume (yellow arrowheads). c Approximately 330 ml of serous fluid was egested from the tumor