The four main stages or types of endometriosis are:
Subtle: Subtle types look like a small sac or cyst, ranging from 1 to 3mm in size.
They are not serious, but can look like ovarian cancer.
Typical: These appear as black spots over a white fibrous area and vary in size from 1 to 2cm in diameter.
They are found around the pelvis and/or diaphragm.
Cystic Ovarian: This stage involves cysts bigger than 4 to 5cm, growing as large as 15cm, and covering the ovary.
They may form adhesions with the wall of the pelvis or other organs in the pelvis.
Deep: In this stage, solid tumors of up to 5 or 6cm in diameter are mostly found in the space between the back wall of the uterus and the rectum.