. Journal of radiology . ho have been findingthese changes in the lung have beenmaking the same interpretation that wedid previously to the last year, that is,they have been calling these changesmetastases into the lungs and pleuraewhen in reality they are fibroses pro-duced by radiation. It will be noted by making a detailedstudy of the x-ray findings as givenunder the case reports that a steadilyprogressive change takes place in thelungs and pleurae following is surprising to notice how littleradiation produced the change in someof the patients. Seven cases here re-ported show t
. Journal of radiology . ho have been findingthese changes in the lung have beenmaking the same interpretation that wedid previously to the last year, that is,they have been calling these changesmetastases into the lungs and pleuraewhen in reality they are fibroses pro-duced by radiation. It will be noted by making a detailedstudy of the x-ray findings as givenunder the case reports that a steadilyprogressive change takes place in thelungs and pleurae following is surprising to notice how littleradiation produced the change in someof the patients. Seven cases here re-ported show that the change was recog-nized in one case after 1 20 milliampereminutes irradiation over the back ofthe chest. This dosage was given intwo series, each series composed of 60milliampere minutes dosage. Out ofthese seven cases the one having thelargest dose before changes were recog-nized, had 540 milliampere minutesover the front of the chest and 190 469 I HEAVY RADIATION EFFECTS ON PLEURAE AND LUNGS—TYLER AND BLACKMAN. Fig-. 1—Case No. 14610—Mrs. J. P. A.—(1) Roentgeno-gram made at time of patients admission beforetreatment was given, showing some increase in theright hilum. (2) First examination, showing in-creased density in the right lower lobe with limita-tion of movement of the inner half of the diaphragm. (3) Roentgenogram made approximately two monthslater, showing marked increase in density in the rightlower lobe (4) One year later than No. 3. showingcorappe of the lower part of the right lung andmarked increase in density above the site of the col-lapse. milliampere minutes over the back ofthe chest. The average for the sevenis 257 milliampere minutes in frontand 190 milliampere minutes on theback. From these figures it will beseen that the dosage which was givenwas really not as much as we frequentlyuse in treating malignancy. We can-not explain why some patients developthese changes so much more quicklythan others and under so much lessdosage. It would seem
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