When a diagnosis of endometrial cancer is confirmed on biopsy, women get staged to assess the level of spread. Current gold standard is an MRI. A proportion of women, are unable to undergo or complete an MRI scan due to their morbid obesity or claustrophobia. To this end, many have assessed the role of ultrasound in staging endometrial cancer as a cheaper and easier alternative to an MRI. In the last 20 years there has been a rise in the use of 3D ultrasound as it has become commercially available. There is, however a paucity of data on the role of 3D ultrasound in the assessment of myometrial invasion. This research project will assess whether 3D ultrasound is a safe, effective alternative to MRI to assess the depth of spread of womb cancer.