The practice of obstetrics, designed for the use of students and practitioners of medicine . cental calculi,ossiform concretions, placental ossi-fication, stone placenta, have alreadybeen noted under the subject of in-farcts. These deposits are almostalways found on the uterine placen-tal surface, in the decidua serotina, whence they may extend to the fetal part of the placenta. When the degener-ation begins in the fetal structures, it is confined to them, and implicates thesmall blood-vessels of the villi, extending from their tiny extremities to theirtrunks. These concretions are in the form
The practice of obstetrics, designed for the use of students and practitioners of medicine . cental calculi,ossiform concretions, placental ossi-fication, stone placenta, have alreadybeen noted under the subject of in-farcts. These deposits are almostalways found on the uterine placen-tal surface, in the decidua serotina, whence they may extend to the fetal part of the placenta. When the degener-ation begins in the fetal structures, it is confined to them, and implicates thesmall blood-vessels of the villi, extending from their tiny extremities to theirtrunks. These concretions are in the form of grains, needles, or scales. Theyconsist of amorphous carbonates and phosphates of lime and magnesia; asmany as five hundred have been found in one placenta (Chambord). Stonyscales or laminse or even larger formations may be found in placentae thathave been left in titero weeks or months after the occurrence of fetal the common form, during the life of the fetus, the placental function is notdisturbed. (7) Fatty Degeneration.—This frequently occurs, and modern investigation. Fig. 27S.—Multiple Cysts on the FetalSurface of the Placenta.—{Ribentoni-Lepage.) 236 PATHOLOGICAL PREGNANCY. tends to show that fatty change is usually consecutive to the fibrous metamor-phosis (Robin-Ercolani). It sometimes occurs in the decidua serotina. Here,however, it is part of a chronic endometritis, the placenta being involvedsecondarily (interstitial endometritis of Hegar). A fibrous change may occurin the vilH themselves, or in the interspaces; the usual contraction, obliterationof vessels, and fatty change following. This fatty tissue is friable and greasy tothe touch. It greases any substance with which it comes in contact, and israther firm in consistency. (8) Miscellaneous Degenerations.—So-called hyaline degeneration is a pheno-menon which accompanies white infarction. Pigment deposits consist of hemo-globin or its derivatives and result from extravasations of blood. They
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
