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The book consists of case reports, serial x-ray films and carefully studied comments on the earliest film signs of focal development in the tuberculous. The work deals at length with the subject of successive infiltrations (Schuebe). An interesting series of roentgenograms demonstrates the progress of the process from the minimal to the grosser lesion. The subject is more easily understood if recourse is had to the first report on it by the same authors. The writers raise the question Can one differentiate between a really new focus and a perifocal inflammatory reaction of an old focus which is buried, so to speak, in an infiltrated area? Arguing the matter, they say that if one accepts the views of Romberg it is easy to recognize that early infiltrations may arise from previously existing small isolated foci. It is quite another thing, say the authors, whether early infiltrations, the term being used
Studien zur Entwicklung der menschlichen Lungenphthise: II. Phthisische Entwicklungen aus den Reihen des Frühinfiltrates und des frühen phthisischen Nachschubes.. JAMA. 1932;98(9):760. doi:10.1001/jama.1932.02730350074036