According to study conducted at University College London, an ultrasound scan can be used to detect endometrial (womb) cancer before any symptoms occur. The scientists analysed the findings of ultrasound scans of more than 37,000 women to identify thickening of the endometrium, the womb lining. The scans were undertaken as part of the UK Collaborative Trial for Ovarian Cancer Screening, which involved more than 200,000 UK women. The study showed that the scans detected a significant difference in womb lining thickness in the 133 women who were diagnosed with womb cancer or atypical endometrial hyperplasia, a precursor of the cancer. The scientists were able to classify 25% of the screened women as high risk based on factors associated with endometrial cancer.Among the high risk group, nearly 40% of the women had endometrial cancer or atypical endometrial hyperplasia.