Flashcards - Placenta Accreta Spectrum : Imaging and Diagnosis -Answers based on TOG Jan 2025

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Question 1

Most common cause of placenta accreta spectrum (PAS) is ______.

Answer

Caesarean birth

Question 2

MRI is superior in diagnosing placenta accreta spectrum (PAS) – True or False?

Answer

False (USS and MRI have similar diagnostic value. MRI only used as an adjunct).

Question 3

What is likely a precursor of PAS?

Answer

Caesarean scar pregnancy

Question 4

Main blood supply to the uterus comes from

Answer

Uterine arteries. (Uterine arteries then give rise to arcuate arteries and radial arteries)

Question 5

Which arteries supply the myometrium and basalis layer of the endometrium?

Answer

Basal arteries (at the level of junctional zone, radial arteries branch laterally to form basal arteries).

Question 6

Which arteries supply the endometrium?

Answer

Spiral arteries

Question 7

How much do the spiral arteries dilate at the mouth during remodelling at the time of pregnancy?

Answer

5- to 10 – fold dilatation

Question 8

PAS is an iatrogenic disease – True or False?

Answer

True

Question 9

FIGO classification (grading) of placenta accreta spectrum

Answer

Question 10

Most common cause of uterine scar is

Answer

Caesarean section

Question 11

Should Methotrexate be used for PAS?

Answer

No evidence, as no rapidly dividing cells in syncytiotrophoblast.

Question 12

Gold standard test for diagnosis of placenta accreta is

Answer

Histopathology

Question 13

Bulge sign and Dimple sign – seen in what grade of placenta accreta spectrum?

Answer

Grade 2 – Placenta increta

Question 14

Grade 3a of placenta percreta is

Answer

Limited to uterine serosa

Question 15

Grade 3b of placenta percreta is:

Answer

Urinary bladder invasion

Question 16

Grade 3c of placenta percreta is :

Answer

Invasion of other pelvic tissues/organs (other than bladder).

Question 17

Craniocaudal hypervascularity within the serosa can be seen in :

Answer

Placenta increta

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