MRI pelvis in a woman with suspected placenta accreta spectrum reveals loss of the normal dark myometrial line behind the placenta, placental bulge into the myometrium, and bridging vessels crossing the placenta-myometrium interface. The specific accreta subtype MOST likely is:

• A Placenta accreta (Grade 1)
• B Placenta percreta (Grade 3)
• C Placenta increta (Grade 2) ✓
• D Vasa praevia

Explanation

In placenta accreta spectrum (PAS): Grade 1 (accreta) shows superficial invasion without myometrial penetration; Grade 2 (increta) shows invasion into but not through the myometrium — evidenced on MRI by loss of the myometrial dark band and intramyometrial placental tissue; Grade 3 (percreta) shows invasion through the myometrium to the serosa or beyond with abnormal vessels invading adjacent organs. The MRI features described (loss of dark myometrial band, placental bulge into myometrium, bridging vessels limited to myometrium) best fit increta. Vasa praevia is a separate condition with velamentous cord insertion.

Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.