In placenta accreta spectrum (PAS) disorder, the pathological classification 'placenta increta' corresponds to which histological finding on uterine specimen?

• A Chorionic villi adherent to but not penetrating the myometrium (no decidua basalis)
• B Chorionic villi invading into the myometrium but not reaching serosa ✓
• C Chorionic villi penetrating through the full thickness of the myometrium to the serosa
• D Chorionic villi invading the bladder wall or adjacent parametrial structures

Explanation

In placenta accreta spectrum: accreta = villi attach to myometrium without intervening decidua (no myometrial invasion); increta = villi invade into but not through the myometrium; percreta = villi penetrate through the myometrium to or through the serosa, potentially involving adjacent organs like bladder. The pathological distinction is based on the depth of trophoblastic invasion relative to the myometrial layers and uterine serosa.

Reference: Williams Obstetrics, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.