In the records of the Surgical Service of the Johns Hopkins Hospital, there are sixty-two cases of lung abscess. It is our purpose briefly to summarize these cases in order to present to you what our experience with lung abscess has been.
Etiologically, these cases may be divided into four groups:
Thirty-one cases followed pneumonia associated with, or unassociated with, empyema.
Sixteen cases were postoperative, in the sense that they followed a postoperative bronchopneumonia or the aspiration of some infectious material. Four cases followed tonsillectomy; seven, intra-abdominal operations; two followed mastoid operations, and one, each, a hernia, an open reduction of a fracture and a breast operation.
Seven cases followed acute abdominal infections, of which four were liver abscesses secondary to acute abdominal infections; one a pelvic peritonitis, and two subphrenic abscesses secondary to appendicitis.
Eight cases followed a miscellaneous group of conditions. Two followed the