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