In placenta accreta spectrum (PAS) disorder, which histological variant is characterised by chorionic villi invading into the myometrium but NOT penetrating it fully?
- A Placenta accreta vera
- B Placenta increta ✓
- C Placenta percreta
- D Placenta membranacea
Correct answer: B. Placenta increta
Explanation
Placenta increta (25% of PAS cases) is defined by chorionic villi that invade into the myometrium. In placenta accreta vera (the most common, ~75%), villi adhere to the myometrium without invasion due to absence of the decidua basalis. Placenta percreta (~5%) penetrates the full thickness of the myometrium and can invade adjacent organs such as the bladder or bowel.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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