. Surgery, its principles and practice . of Leonard and Rumpel, consideredsufficient to make a negative diagnosis as to stone. Even great obesitydoes not preclude the probability of a reliable plate. Leonard reports three hundred and thirty-one examinations for 198 SURGERY OF KIDNEY, URETER, AND SUPRARENAL GLAND. kidney stones with only 3 per cent, of failures. From Kimimels andRumpels eighty-four cases of renal stone, sixty-five positive results wereobtained after the technic had been perfected. Altogether, three hundredand twenty-eight a;-ray examinations were made. In almost every in-stance


. Surgery, its principles and practice . of Leonard and Rumpel, consideredsufficient to make a negative diagnosis as to stone. Even great obesitydoes not preclude the probability of a reliable plate. Leonard reports three hundred and thirty-one examinations for 198 SURGERY OF KIDNEY, URETER, AND SUPRARENAL GLAND. kidney stones with only 3 per cent, of failures. From Kimimels andRumpels eighty-four cases of renal stone, sixty-five positive results wereobtained after the technic had been perfected. Altogether, three hundredand twenty-eight a;-ray examinations were made. In almost every in-stance the shadow of the stone in form and size is like the stone foundat the time of the operation. The ease with which the rays penetrate a stone varies according to thechemical composition. The hard stones formed by the oxalates arepenetrated with the greatest difficulty, and, therefore, are most easilylocated by radiography. Uric-acid stones are a little more difficult tofind by reason of their greater permeability. Phosphatic stones, on.


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