Endometrial polyps are common benign tumours of the endometrial cavity.
They are most common after the age of 40 years and are rare before menarche.
Typical ultrasound appearance is of a hyperechoic endometrial mass which may or may not contain cystic spaces. A feeding vessel is often demonstrated from its base on power Doppler.
NB: Submucosal fibroids are generally of reduced echogenicity (hypoechoic).
On MRI, a mass which contains a central fibrous core that enhances post-contrast and also contains well-demarcated T2-hyperintense cysts suggests endometrial polyp.
An intact junctional zone and smooth tumour-myometrial interface also favour a polyp.
