PULMONARY infarction is considered to be extremely rare in children. Although it does not occur frequently, it is encountered much oftener than is commonly believed. In this paper the relative frequency of pulmonary infarction in children and the conditions under which it may occur will be considered.
A review of the literature revealed that the first case of pulmonary infarction in a child was reported in 18331 and that since that time reference has been made to at least 100 cases among children; 74 of these cases were reported in some detail. New data included here comprise material from 38 additional cases. Thirty-five of these cases were drawn from the records of the Mayo Clinic for 1910 to 1945, inclusive, and the other 3 cases were observed in the department of pathology, University of Minnesota, in 1941 and in 1944.
CONTROLLING FACTORS IN PULMONARY INFARCTION
The factors in the