"In general, the earlier gestational age a hematoma was diagnosed, the worse outcome the pregnancies tended to have. One reason for this may be, in the middle and late pregnancy, the gradually diminishing cervical barrier resulting in fast outflow and reduced intrauterine retention of blood when uterine hemorrhage occurs [37]."
http://www.ajronline.org/doi/pdf/10.2214/ajr.149.4.737
The first decent explanation of a hematoma:
The subchorionic hematoma probably results from marginal
placental abruption during the first half of pregnancy. For
unknown reasons, blood, instead of collecting behind the
placenta as happens in the third trimester, works its way
behind the chorionic membrane and subsequently leaks into
the cervical canal. This causes its elevation from the uterine
wall. The subchorionic hematoma tends to compress the
gestational sac, and in two of our cases this led to premature
rupture of the membranes and subsequent abortion.
http://www.theovalplanet.com/post.cfm/poor-outcomes-in-patients-with-low-papp-a-during-testing-for-down-syndrome
Awesome, something I want to investigate more - PAPP-A levels and miscarriage
From Wikiepedia:
This gene encodes a secreted metalloproteinase which cleaves insulin-like growth factor binding proteins (IGFBPs). It is thought to be involved in local proliferative processes such as wound healing and bone remodeling. Low plasma level of this protein has been suggested as a biochemical marker for pregnancies with aneuploid fetuses (fetuses with an abnormal number of chromosomes).[2] For example, low PAPPA may be seen in prenatal screening for Down syndrome.[1] Low levels may alternatively predict issues with the placenta, resulting in adverse complications such as intrauterine growth restriction, preeclampsia, placental abruption, premature birth, or fetal death.
http://www.jultrasoundmed.org/content/suppl/2015/06/12/8.6.289.DC1/08.06.289.pdf
http://www.pubfacts.com/search/subchorionic+hematoma
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