A patient at 32 weeks with a previous uterine scar presents with a low-lying anterior placenta on ultrasound. MRI confirms loss of the normal retroplacental clear space with placental tissue extending into the myometrium but not beyond the serosa. The most accurate diagnosis is:

• A Placenta previa
• B Placenta accreta
• C Placenta percreta
• D Placenta increta ✓

Explanation

Placenta increta is defined by villous invasion into the myometrium but not reaching the serosa. Placenta accreta involves superficial attachment without invasion. Placenta percreta extends through the serosa and may invade adjacent organs. The MRI description of invasion into myometrium without serosal breach is characteristic of increta.

Reference: Williams Obstetrics, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.