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This dissertation is a detailed study of spontaneous pneumothorax occurring in apparently healthy persons. For this condition Kjaergaard plausibly suggests the term "pneumothorax simplex," which is to be used for all cases of spontaneous pneumothorax occurring without demonstrable cause in healthy persons in whom no sign of tuberculosis can be found and in whom the disease takes an afebrile course without pleural effusion. In this class are also to be included cases in which the patients have a slight rise of temperature in the first week of the illness and cases in which the roentgenograms show the presence of an insignificant pleural exudate, too small to be made out on auscultation.
On the basis of facts obtained on observation of the sixty-one attacks seen in his own series of fifty-one patients and from a study of about two hundred cases reported by other authors, Kjaergaard arrives at important generalizations as
Spontaneous Pneumothorax in the Apparently Healthy.. Arch Intern Med (Chic). 1936;57(3):644. doi:10.1001/archinte.1936.00170070169015