A textbook of obstetrics . 365 infants, whereofiNj were said to be males, as many females, and the odd one a hermaphrodite (1276 A. 1). ). 3 Jour, de Med., t. xxii. p. 171, l8ll. 1 \o. 1, De la Faune des Med., Priestley. 5 Nouvelles Recherches sur le Mole vesiculate. broch., Paris, 1N27. 6 l)e lArt des Accouchements. io6 PREGNANCY. which replace the epithelial covering (exochorion) of the chorion(Ercolani); and, finally, to a pathological hyperplasia of thesyncytium. Virchows l explanation is that thechange resultingin the cystic degeneration of the chorion villi takes place altogetherm the en
A textbook of obstetrics . 365 infants, whereofiNj were said to be males, as many females, and the odd one a hermaphrodite (1276 A. 1). ). 3 Jour, de Med., t. xxii. p. 171, l8ll. 1 \o. 1, De la Faune des Med., Priestley. 5 Nouvelles Recherches sur le Mole vesiculate. broch., Paris, 1N27. 6 l)e lArt des Accouchements. io6 PREGNANCY. which replace the epithelial covering (exochorion) of the chorion(Ercolani); and, finally, to a pathological hyperplasia of thesyncytium. Virchows l explanation is that thechange resultingin the cystic degeneration of the chorion villi takes place altogetherm the endochorion, which forms the inner of the two layers thatcompose the chorion and is continuous with the Wharton jellyof the umbilical cord; this change consists of the overproductionot true mucous tissue within the villi, into which the mucous tis-sue extends at first alone, but afterward accompanied by blood-vessels. The process usually begins at a time when the villiare almost equally developed over the whole ovum, that is. Fig. 78.—Cystic degeneration of the chorion [from a photograph). before the third month,—and, therefore, when the vesicular,chorion is expelled the disease is usually found equally distributedover the whole .sin-face, showing no evidence of special develop-ment at anyone point that might indicate where the placentashould have been situated. The general involvement of the w holechorion is the rule, but exceptionally the placenta .done isaffected, the < having doubtless, in such cases, begunafter the atrophy of the villi had taken place over the extra-placental portion of the chorion. Still more rarely will the Die Krankhaften Geschwillste, Bd. i, S. 405. THE CHORION. 107 disease be found in isolated spots upon the chorion are recorded cases in which one chorion of a twin concep-tion was vesicular while the other remained normal. Accordingto the foregoing explanation, the disease is a true myxoma ofthe chorion, and the epithelial c
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