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Fetus abortion
Description
Sections for histology
For a more thorough examination of specimens for fetal
malformations and chromosomal abnormalities, see:
Table App E-1 -- Relations of age, size, and weight in the human
embryo
1 Sex; weight; crownrump length (A), crownheel length (B), or
foot length (C) (see accompanyingdrawings, p. 2601)
2 Approximate length of gestation (see Table App E-1 and
drawings p. 2601)3 General condition: well preserved?
macerated?
4 External and internal anomalies and other changes
5 Umbilical cord: appearance, number of vessels
6 Placental tissues accompanying fetuses:
a Weight
b Membranes: insertion, color, transparency, completeness;
extramembranous pregnancy?marginal or membranous hemorrhage?
c Umbilical cord: insertion, color, focal changes
d Chorionic plate: vascular pattern, vessel caliber, color;
subchorionic hemorrhage?
e Villi: hydatidiform change? (note proportion of involved villi
and size of cysts); focal lesions?
1 Small embryos: submit whole embryo or one half, depending on
size
2 Large fetuses: submit one section from lungs, stomach
(including gastric contents), kidneys, and otherorgans, as
indicated
3 Placental tissues:
a Extraplacental membranes (one section)
b Umbilical cord (one section)
c Chorionic plate (one section)
d Villi from chorion frondosum, including maternal surface (one
section)
1 Klatt EC. Pathologic examination of fetal specimens from
dilation and evacuation procedures. Am J ClinPathol 1995, 103:
415418
2 Robboy SJ, Kraus TF, Kurman RJ. Gross description, processing,
and reporting of gynaecologic andobstetric specimens. In Kurman RJ
(ed.): Blaustein's pathology of the female genital tract, ed. 4.
NewYork, 2002, Springer-Verlag, pp. 13191346
3 Szulman AE. Examination of the early conceptus. Arch Pathol
Lab Med 1991, 115: 696700
AMOUNT OF INCREASE EACHMONTH WHEN VALUE AT START OF
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From Arey LB. Developmental anatomy, ed. 7, revised.
Philadelphia, 1974, W.B. Saunders, p. 104.
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MONTH EQUALS UNITY
Age ofembryo
Crownrump(CR) length(mm)
Crownheellength (mm)
External diameterof chorionic sac(mm)
Weight ingrams
CR length Weight
One week 0.1* 0.2
Two weeks 0.2* 3
Threeweeks
2.0 10
Fourweeks
5.0 10 0.02 49.0 40000.00
Five weeks 8.0 25
Six weeks 12.0 30
Sevenweeks
17.0 19.0 40
Two lunarmonths
25.0 30.0 50 1 3.6 49.00
Threelunarmonths
56.0 73.0 14 1.4 13.00
Four lunarmonths
112.0 157.0 105 1.0 6.50
Five lunarmonths
160.0 239.0 310 0.43 1.95
Six lunarmonths
203.0 296.0 640 0.26 1.07
Sevenlunarmonths
242.0 355.0 1080 0.14 0.69
Eight lunarmonths
277.0 409.0 1670 0.14 0.55
Nine lunarmonths
313.0 458.0 2400 0.13 0.43
Full term(38 weeks)
350.0 500.0 3300 0.12 0.38
*Total length of embryonic disc.
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