143 patients with lung abscesses were hospitalised at the Department o
f Surgery at University Hospital Zurich from 1946 to 1990. Analysing o
ur patients in a retrospective study we concluded as follows: 1. Lung
abscesses have nearly disappeared in our patients. 2. Lung abscesses c
an be cured without lethality. 3. Cancers of the lung causing abscesse
s were not seen any more since 1960. 4. A compromised immunological sy
stem appeared as a new pathogenetical factor since the beginning of th
e 1980ies.