The collapse of one lobe of the lung may take place in various locations and from several causes. Its actual occurrence is so restricted to the atelectasis of a lower lobe, characterized radiologically, by a basilar triangular shadow, that its discussion is practically limited to the study of the latter condition. Since Dieulafoy1 first described these shadows in 1910 there has been no dearth of literature on the subject. My only excuse for adding to its volume is the clinical and pathologic material that I have to present, which may add to the elucidation of a still unsettled problem.
Before proceeding with the discussion of basilar triangular shadows, I would like to mention the rarer cases in which lobar collapse of an upper lobe occurs. Years ago, Heller2 described a series of cases of bronchiectasis in children from 9 months to 7½ years of age. The lesions involved
BOYD GL. LOBAR COLLAPSE IN CHILDREN. JAMA. 1935;105(23):1832–1835. doi:10.1001/jama.1935.02760490016004