MSFinals-3588
A 35-year-old woman with G4P3 at 39 weeks gestation presents to the labour ward following a spontaneous rupture of membranes. She delivers a healthy baby vaginally but experiences excessive bleeding and hypotension. Despite attempts to control the bleeding, the senior doctor decides to perform a hysterectomy. Upon examination, the pathologist observes that the chorionic villi have deeply invaded the myometrium but not the perimetrium.
What is the diagnosis?