William Pasteur CB CMG FRCP (1855–1943) was a British physician and pioneer of pulmonology.
[7] On 15 May 1911 he delivered his presidential address to the Medical Society of London on post-operative lung complications.
[1] For his military service, Pasteur was mentioned in dispatches and was appointed CB in 1918 and CMG in 1919.
His Bradshaw Lecture of 1908 discussed massive collapse of the lung after operation, a condition to which he referred again in an article in 1914 and one which, indeed, owed its discovery and description to Pasteur.
He became a captain in the British Army, was killed in action on 10 July 1917 in West Flanders, and was awarded the Military Cross.
It occurs when the tiny air sacs (alveoli) within the lung become deflated or possibly filled with alveolar fluid.