Medical imaging such as ultrasound and CT scan may also be useful. Imaging the hamstring muscles is usually performed with an ultrasound and/or MRI. Atypical histories often require imaging with ultrasound or CT scanning. These may include urine sediment analysis, renal ultrasound and/or kidney biopsy. Use of doppler ultrasound in the diagnosis has been suggested. This celebrated the Scottish pioneers of obstetric ultrasound imaging. Diagnosis is typically confirmed by abdominal ultrasound. Visual analysis is also available using specialized medical equipment such as ultrasound and endoscopy. It can be an abdominal ultrasound or transvaginal ultrasound. Confirmation of cardiac auscultation can be obtained by non-invasive cardiac ultrasound (echocardiography). Diagnosis is typically based on an examination together with ultrasound or a CT scan. Diagnosis is typically based on a physical exam, ultrasound, and blood tests. They grow and can become painful irritants that may require surgery or ultrasound treatments. However, carotid angiography is not advisable in the presence of a normal ultrasound and CT. A 2007 study on two women involved ultrasound, endoscopy, and biochemical analysis of fluid.