A textbook of obstetrics . in and albumin in consider-able quantities. 1 Winogradow, Virchows Archiv, 2 Loc. cit., p. 37. :87o, Bd. li, S. 146. io8 PREGNANCY. Within the center of the vesicular mass is usually to be founda shriveled or distorted fetus surrounded by its amnion, whichoccasionally contains an abnormal quantity of fluid (hydramnios).Occasionally, however, no trace of the embryo is to be discov-ered, or at most there may be seen only the remnants of anumbilical cord. More rarely the fetus, although dead, is appar-ently well developed for the date of pregnancy,1 and if the de-genera
A textbook of obstetrics . in and albumin in consider-able quantities. 1 Winogradow, Virchows Archiv, 2 Loc. cit., p. 37. :87o, Bd. li, S. 146. io8 PREGNANCY. Within the center of the vesicular mass is usually to be founda shriveled or distorted fetus surrounded by its amnion, whichoccasionally contains an abnormal quantity of fluid (hydramnios).Occasionally, however, no trace of the embryo is to be discov-ered, or at most there may be seen only the remnants of anumbilical cord. More rarely the fetus, although dead, is appar-ently well developed for the date of pregnancy,1 and if the de-generation of the chorion has not been too extensive, a living,healthy infant may be born along with a vesicular Ithas been already noted that between amnion and chorion maybe found a thin layer of jelly-like substance continuous with theWhartons jelly of the umbilical cord. There is a case on rec-ord 3 in which this substance formed a layer four to five milli-meters thick, originating from a mucous degeneration of the. Fig. 80. Fig. 81. Microphotographs of myxoma of the chorion (prepared for the author by Dr. H. L. Williams). connective-tissue layer of the chorion, without involvement ofthe villi of either the chorion laeve or frondosum, thus consti-tuting a peculiar and, up to the present time, unique variety ofmyxoma of the chorion. The relation of the cystic chorion to the two deciduae isoften peculiar and complicated. Occasionally the membranesretain their normal relative position of external deciduae, median Edin. Med. 1 Priestley, loc. cit., p. 42. 2 Schroeder, Lehrhuch d. Geb., 8th ed., p. 442; and Sym,Jour., Aug., 1887, p. 102. 3 Wiener med. Presse, 1867, Bd. i; and Virchows Archiv, Bd. xxxix, THE CHORION. IO9 chorion, and internal amnion ; but frequently the enlarged villiof the chorion perforate either one or both deciduae over surfacesof varying extent. Thus, specimens have been described 1 inwhich the cystic mass was inclosed between the decidua veraand th
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