ABSTRACT
In obstetrics and gynaecology, transabdominal and/or transvaginal US may be performed. US are by far the most common imaging technique in obstetrics and gynaecology. US is the investigation of choice at all stages of pregnancy. US are the primary imaging investigation of choice for assessment of gynaecological disorders. US may be used to confirm viability and dating of early pregnancy, and to assess placental position and fetal morphology in later pregnancy. Magnetic resonance imaging (MRI) is used increasingly in obstetrics and gynaecology. MRI is used increasingly in gynaecology for diverse indications including suspected endometriosis, diagnosis of uterine pathology such as adenomyosis, and staging of gynaecological malignancies. Obstetric US scan for assessment of fetal morphology is best performed at 19–21 weeks’ gestation. The fetal morphology scan should only be performed when the referring doctor and patient have a clear view of the benefits and limitations of the technique.
