In future it will grow in size and occupy space in abdomen and you wrote it as mass and we don't know the nature of mass, what it is exactly, it could be fibroid, adenomyoma or any malignancy.
It is always better to get rid of disease instead of letting.g it grow Inside of abdomen.
Next Steps
Go for 3d usg and investigate it properly.
Health Tips
rule out the malignancy first