Which of the following is not a sonographic criterion for cesarean scar pregnancy
Sonographic criteria for cesarean scar pregnancy include 

Empty uterine cavity - bright hyperechoic endometrial stripe
Empty cervical canal
Intrauterine mass seen in anterior part of uterine isthmus.
Anterior uterine isthmic mass
Hourglass uterine shape
Empty cervical canal
Hyperechoic thin endometrial stripe
Hourglass uterine shape