Abstract
Mr. President, Members of the Institute, Ladies and Gentlemen: Many of you are aware of the signal honour conveyed by the invitation to present this lecture. It is a high distinction, doubly esteemed by me, a visitor to these shores. I am happy, indeed, to be here and join with you in commemorating the distinguished career of Mackenzie Davidson, outstanding pioneer British radiologist. One must embark on this lecture, however, with some misgivings, conscious of the lofty standards which have been set by a long array of eminent predecessors. One can only hope to approach their excellence. The cordial greetings I bring you from American colleagues, and the importance of the subject under discussion will I trust compensate for some of my own shortcomings. Your invitation brings me another special personal satisfaction in that I believe it implies some recognition of paediatric radiology as a respectable and valid medical entity. My subject was selected over others for several reasons. I believe it to be the least well known and the most abused important subject in the entire field of paediatrics and radiology. It is one which I have studied for more than 20 years; one for which I have been able to assemble substantial and, I hope, convincing material. The morbid anatomy and causal mechanisms are shown beautifully in the films themselves.

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