Difference between revisions of "Placenta"

Placenta (view source)

907 bytes added , 16:15, 30 October 2013

48,873

edits

@@ Line 845: / Line 845: @@
 #**Normal spacing is ~1x smallest villus or larger.
 #***In perivillous fibrin deposition - spacing usu. larger than normal.
-#Prominent syncytial knots.
+#Prominent syncytial knots. ‡
 #Thickened trophoblastic basement membrane (below [[cytotrophoblast]]s).
 #+/-Changes seen in decidual vasculopathy:
@@ Line 851: / Line 851: @@
 #**[[Fibrinoid necrosis]].
 #**Vessel wall lipid deposition.
+Note:
+*‡ The normal number is dependent on the gestational age:<ref name=pmid20017638>{{Cite journal  | last1 = Loukeris | first1 = K. | last2 = Sela | first2 = R. | last3 = Baergen | first3 = RN. | title = Syncytial knots as a reflection of placental maturity: reference values for 20 to 40 weeks' gestational age. | journal = Pediatr Dev Pathol | volume = 13 | issue = 4 | pages = 305-9 | month =  | year =  | doi = 10.2350/09-08-0692-OA.1 | PMID = 20017638 }}</ref>
+<center>
+{| class="wikitable sortable"
+! Gestational age
+! Villi with knots (average)
+! Villi with knots (range)
+|-
+| 40 weeks
+| 29 %
+| 27-36 %
+|-
+| 39 weeks
+| 29 %
+| 23-34%
+|-
+| 38 weeks
+| 27 %
+| 23-33 %
+|-
+| 37 weeks
+| 28 %
+| 24-33 %
+|-
+| 36 weeks
+| 23 %
+| 20-26
+|-
+| 34 weeks
+| 18 %
+| 12-22 %
+|-
+| 32 weeks
+| 13 %
+| 10-16 %
+|-
+| 30 weeks
+| 13 %
+| 10-17 %
+|-
+| 26 weeks
+| 11 %
+| 10-13 %
+|-
+| 22 weeks
+| 7 %
+| 5-9 %
+|}
+</center>
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