History:A24-year-oldpatientundergoesroutinesecond-trimesterultrasound.

1.Whatshouldbeincludedinthedifferentialdiagnosis?(Chooseallthat

apply.)

A.Choledochalcyst（胆总管囊肿)

B.Ovariancyst

C.Urachalcyst

D.Mesentericcyst

E.Umbilicalveinvarix（脐静脉扩张）

答案：E

2.Allofthefollowingstatementsconcerningtheumbilicalcordorumbilicalveinandarteriesaretrueexcept:

A.Therearetwoarteriesintheumbilicalcord.

B.Umbilicalarterialflowisawayfromthefetus.

C.Umbilicalvenousflowistowardthefetus.

D.Therearetwovesselswithintheumbilicalcord.

答案：D

3.Allofthefollowingstatementsconcerningtheumbilicalveinvarixare

trueexcept:

A.Umbilicalveinvarixisnotalwaysanisolatedabnormality.

B.Anassociationofumbilicalveinvarixandchromosomalabnormalities

hasbeenreported.

C.Normalumbilicalveinsizeisapproximately8mmat20weeks’

gestationand16mmatterm.

D.Oneofthecriteriafordiagnosisofvarixoftheumbilicalveinisthatitisat

least50%largerthanthediameteroftheintrahepaticumbilicalvein.

答案：C

4.Concerningmanagementofumbilicalveinvarix,allofthefollowing

statementsaretrueexcept:

A.Umbilicalveinvarixhasbeenassociatedwithfetaldemise（死亡）.

B.Associatedabnormalitiesmayac







































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