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Molar Pregnancy
Ectopic Pregnancy - Description Ectopic Pregnancy - Diagnosis & Treatment Molar Pregnancy - Description Molar Pregnancy - Symptoms & Diagnosis The Dilation & Curettage Procedure
Molar
Pregnancy (Hydatidiform Mole):
Molar
pregnancy is very rare. It is also called “a mole".
A molar pregnancy is the result of a (purely chance) genetic error during
the fertilisation process that in turn
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causes the growth of abnormal tissue
(which is not an embryo) within the uterus. The growth of this material is very rapid compared to normal
foetal growth. It has the
appearance of a large and random collection of grape-like cell clusters.
There
are two types of hydatidiform molar pregnancy, ‘complete’ and ‘partial’.
In
a ‘complete mole’ the mass of tissue is completely made up of abnormal cells
that would have become the placenta in a normal pregnancy. There is no foetus
and nothing can be found at the time of the first scan.
In a ‘partial mole’, the mass may contain both these abnormal cells and often a foetus that has severe defects. In this case the foetus will be consumed by the growing abnormal mass very quickly.
Another
(extremely rare) version of a partial mole is when twins are conceived but one
embryo begins to develop normally whilst the other is a mole.
In these cases, the healthy embryo will again very quickly be consumed by
the abnormal growth.
For
the more scientifically minded amongst you:
Complete
moles often have a diploid (double) karyotype (chromosome analysis) 46,XX due to
fertilisation of an empty egg by a single sperm followed by reduplication of the
haploid (single) chromosome.
Partial
moles have a triploid (triple) karyotype (69,XXX or 69,XXY) due to the
fertilisation of a single egg with two sperm.
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Ectopic Pregnancy - Description
Ectopic Pregnancy - Diagnosis & Treatment
Molar Pregnancy - Description
Molar Pregnancy - Symptoms & Diagnosis
The Dilation & Curettage Procedure
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