A 30 year old G1P0 woman with hypertension at 28 weeks gestational age presents to the emergency department with vaginal bleeding. She also has acute onset back and abdominal pain and uterine contractions. The uterus feels pretty rigid and tender. The mother admits she smokes and just used cocaine. Here is an ultrasound; unfortunately, one of the labels got smudged:
Challenge: What's the diagnosis?
Image shown under fair use.