IUD perforation is ranging from embedment in the myometrium to complete transuterine perforation with migration of the IUD into the peritoneal cavity.

Embedment: refers to IUD penetration into the endometrium or myometrium without extension through the serosa.

Intraabdominal migration occurs when the IUD is freely floating in the abdomen or pelvis, encased in adhesions, or adherent to bowel or omentum. Adhesions can lead to infertility, chronic pain, and intestinal obstruction.