Each year brings increasing numbers of case reports of solitary serous renal cysts. In 1920. Kretschmer1 collected but forty-seven cases reported in the literature, adding one of his own. Only seven years later, Carson2 gathered 142 plus 3 of his own, and in the few months that elapsed before his article was published, 6 new cases had cropped up. Today more than 160 cases have been reported, and whenever this condition is discussed, new cases, not reported in the literature, are mentioned by those present. Löffler,3 in introducing four of his cases, writes: "Retention cysts of the kidney occur as solitary and multilocular cysts and are frequently found by the pathologist. The clinician observes them less frequently because, in themselves, they produce no pain." Branch,4 in a recent article, states that pathologists see these cysts in from 3 to 15 per cent of routine autopsies; and
HERBST R, VYNALEK WJ. SOLITARY SEROUS RENAL CYSTS: WITH A STUDY OF ROENTGEN OBSERVATIONS. JAMA. 1931;96(8):597–603. doi:10.1001/jama.1931.02720340027007
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