Spontaneous pneumothorax and pulmonary malignant disease--a syndrome sometimes associated with cavitating tumours. Report of nine new cases, four with metastases and five with primary bronchial tumours.

Tumours of the lung, primary or secondary, may occasionally be complicated by a pneumothorax, and on rare occasions this may be the presenting feature. Metastatic tumours associated with pneumothorax arise usually from bone or soft tissue sarcomas and hence are more common in the young.