Morphological characteristics of endometriosis vesicles. A, The percentage of implants that developed into vesicles was significantly lower in the endo-enrichment (EE) group compared to the endo-no enrichment (NE). B, The total weight of all vesicles per rat was smaller for the endo-EE group. C, The total vesicle volume per rat was significantly smaller for the endo-EE group compared to the endo-NE group. D, Similar to volume, the total vesicle area per rat was significantly smaller in the endo-EE compared to the endo-NE group. E, Vesicles that developed were classified by grade based on a scale by size. F, Example of a grade 5 vesicle. The white arrow is pointing toward the silk suture used to attach the uterine tissue to the mesentery, which got completely enveloped in the vesicle as it developed. *P < .05; **P < 0.01.