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Summary

Summary Obstetrical Ultrasound –I

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DecidualReaction: STAGE I: •Adecidualreactionisfeatureseeninveryearlypregnancywherethereisathickeningoftheendometriumandaroundthegestationalsac. •Itconsistsofanincreaseinsecretoryfunctionsoftheendometriumattheareaofimplantation. •Thethickeningoftheendometriumvarieswiththemensuralcycle. Gestational Sac: Stage II:4thweek of pregnancy: •Thegestationalsacisthelargecavityoffluidsurroundingtheembryo.Duringearlyembryogenesisitconsistsoftheextraembryoniccoelom,alsocalledthechorioniccavity. •Thegestationalsac(GS)isthefirstsignofearlypregnancyonultrasoundandcanbeseenwithendovaginalultrasoundatapproximately3-weeksofgestationwhenthemeansacdiameter(MSD)wouldapproximatelymeasure2-3mmindiameter. Yolk Sac: Stage III5thweek of pregnancy: •Theyolksacisthefirstvisualizedstructurethatisseenwithinthegestationalsac.Itlieswithinthechorioniccavityandisroutinelyseenfrom5weeksofgestation.Itisattachedtotheembryobytheyolkstalk(vitellineduct).Astheembryoniccavitybeginstoenlarge,theyolksac(whichisextra-amniotic)movesawayfromtheembryoandeventuallydetachesfromtheyolkstalk,andisnolongerconstantlyseenafter12weeksofgestation Theyolksacisamembranoussacattachedtoanembryo,providingearlynourishmentintheformofyolk.Itfunctionsasthedevelopmentalcirculatorysystemofthehumanembryo,beforeinternalcirculationbegins. •YolksacistheOceanoflife. •ACystwithagoodechogenicrim.

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RADIOLOGY
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RADIOLOGY

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, BMIS: 3rd semester
Course Name: Obstetrical Ultrasound –I
Course Code: Obstetrical Ultrasound – I – A

,Basics of OBS & First Trimester:
• Learning Objectives:
What is obstetrics.
Division of trimesters.
Difference in between embryo and fetus.
Difference in between missed abortion and IUFD.
Stages of first trimester.
First trimester complications.
Ultrasound biometry in first trimester.

, Basics of OBS
Dr. Zain ul Hasan
Assistant professor
The University of Lahore
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Uploaded on
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Written in
2023/2024
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  • obstetrical ultrasound i
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