Small fibroid uterus

Small fibroid uterus? Or is an adenomyoma?

Ultrasound images of the uterus show a small isoechoic mass with thin borders near the endometrial stripe in a 45 year old female. 

Most likely a developing fibroid. Adenomyoma is less likely at this age. 

Final diagnosis: fibroid of uterus. 

For more this topic:

Sonography of uterine lesions