USMLE Step 2 CK Lecture Notes 2019: Obstetrics/Gynecology (Kaplan Test Prep)

OB TRIAD

Abnormal    Placental   Invasion

Accreta:    deeper  layers  decidua basalis

Increta:    myometrium  not complete

Percreta:   uterine serosa  or  bladder

Placenta accreta (most common, 80% of cases) occurs when the villi invade
the deeper layers of the endometrial decidua basalis but do not penetrate the
myometrium.
Placenta increta (15% of cases) occurs when the villi invade the
myometrium but do not reach the uterine serosal surface or the bladder.
Placenta percreta (5% of cases) occurs when the villi invade all the way to
the uterine serosa or into the bladder.

http://ebookobgyne.net

http://ebookobgyne.net