| Monochorionic Monoamniotic Twin Placenta
|
Etiology
• unknown
|
Pathogenesis
• result of monozygotic twinning with
separation after the
development of pole,
|
Epidemiology
• monygotic twinning relatively steady in all populations at 3.5/1000.
|
General Gross Description
• chorionic surface with insertion of two umbilical
cords
• no dividing membrane
• single amniotic sac
• superficial anastamoses may be evident between
circulations
•Examples:
|
General Microscopic Description
• unable to discriminate between villi of twins
• no dividing membrane
•Examples:
|
Clinical Correlation
• course may be complicated near term by
knotting of
umbilical cords which may result in fetal demise
|
References
• Cotran RS, Kumar V, Robbins SL: Robbins Pathologic Basis of Disease. 5th ed. Philadelphia, W.B. Saunders, 1994, pp.
1078
• Benirschke K, Kaufmann P. Pathology of the human placenta, 3rd ed. New York: Springer-Verlag, 1995, pp. 719-33.
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| Monochorionic Monoamniotic Twin Placenta
| | Synopsis by: Melinda Sanders M.D. (T88100M29050)[53]
| |