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The optical principles on which cystoscopy is based are more briefly and clearly described in this book than in many similar volumes. That a thorough examination of the entire body should precede the cystoscopy is illustrated by the citation of instances in which attention was called to spinal cord lesions by the cystoscopic findings. The author warns against the use of pneumoroentgenography of the urinary tract. A 25 per cent, solution of lithium iodid is preferable, in his opinion, to any other for pyelography. The absence of ill effects of the latter procedure is strongly emphasized. It is of interest to note that the faint shadow found in certain renal calculus cases is due to the absence of a colloid framework so that the calculus remains very soft. This is not only true of urates but also may be true of oxalates and phosphates. Such a soft calculus may be
Kystoskopische Technik. Ein Lehrbuch der Kystoskopie, des Ureteren-Katheterismus, der Funktionellen Nieren-Diagnostik, Pyelographie, Intravesikalen Operationen. JAMA. 1923;81(17):1465. doi:10.1001/jama.1923.02650170063038
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