| chorio- | Any membrane, especially that which encloses the foetus. Origin: G. Chorion, membrane (05 Mar 2000) |
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| chorioadenoma | <tumour> A benign neoplasm of chorion, especially with hydatidiform mole formation. Chorioadenoma destruens, hydatidiform mole in which there is an unusual degree of invasion of the myometrium or its blood vessels, causing haemorrhage, necrosis, and occasionally rupture of the uterus or embolism of molar tissue to the lungs; there is marked proliferation of the trophoblast, but avascular villi may also be found. Synonym: invasive mole. (05 Mar 2000) |
| chorioallantoic | Pertaining to the chorioallantois. (05 Mar 2000) |
| chorioallantoic graft | Transplanting of living material to the chorioallantoic membrane of the embryonic chick. (05 Mar 2000) |
| chorioallantoic membrane | Extraembryonic membrane formed in birds and reptiles by the apposition of the allantois to the inner face of the chorion. The chorioallantoic membrane is highly vascularised and is used experimentally as a site upon which to place pieces of tissue in order to test their invasive capacity. (18 Nov 1997) |
| chorioallantoic placenta | A placenta (such as that of primates) in which the chorion is formed by the fusion of the allantoic mesoderm and vessels to the inner face of the serosa. (05 Mar 2000) |
| chorioallantois | Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammals it forms the foetal portion of the placenta; in avian embryos it is fused with the shell. (05 Mar 2000) |
| chorioamnionic placenta | A form of placentation in which the amnion is fused to the inside of the chorion, thus permitting interchange of water and electrolytes between mother and foetus. (05 Mar 2000) |
| chorioamnionitis | An inflammatory process involving the chorion, its foetal blood vessels, the umbilical cord, and the amnion by extension of the inflammation, as the amnion itself has no blood supply. This inflammatory process is potentially fatal to mother and foetus. (12 Dec 1998) |
| chorioangioma | <tumour> Benign tumour of placental blood vessels (haemangioma), usually of no clinical significance; large tumours may be associated with placental insufficiency and foetal hydrops; in some instances, the stroma is edematous and may resemble myxomatous tissue. See: chorioangiosis. Origin: chorion + angioma (05 Mar 2000) |
| chorioangiomatosis | An abnormal increase in the number of vascular channels in placental villi; severe chorioangiosis is associated with a high incidence of neonatal death and major congenital malformations. Synonym: chorioangiomatosis. Origin: chorio-+ G. Angeion, vessel, + -osis, condition (05 Mar 2000) |
| chorioangiosis | An abnormal increase in the number of vascular channels in placental villi; severe chorioangiosis is associated with a high incidence of neonatal death and major congenital malformations. Synonym: chorioangiomatosis. Origin: chorio-+ G. Angeion, vessel, + -osis, condition (05 Mar 2000) |
| chorioblastoma | <oncology, tumour> A malignant and rapidly growing tumour which arises from foetal tissue. The preceding factor is a hydatidiform mole. Symptoms include continued vaginal bleeding in a women with a recent history of hydatidiform mole, abortion or term pregnancy. (27 Sep 1997) |
| choriocapillaris | The internal layer of the choroidea of the eye, composed of a very close capillary network. Synonym: lamina choroidocapillaris, choriocapillaris, entochoroidea, lamina choriocapillaris, membrana choriocapillaris, Ruysch's membrane. (05 Mar 2000) |
| choriocapillary layer | The internal layer of the choroidea of the eye, composed of a very close capillary network. Synonym: lamina choroidocapillaris, choriocapillaris, entochoroidea, lamina choriocapillaris, membrana choriocapillaris, Ruysch's membrane. (05 Mar 2000) |