 This pilot clinical trial studies real-time contrast-enhanced ultrasonography and shear wave elastography in predicting treatment response in patients with soft tissue sarcomas. Ultrasonography and elastography are diagnostic imaging tests that use sound waves to make pictures of the body without using radiation x-rays. Real-time contrast-enhanced ultrasonography and shear wave elastography may help measure a patients response to treatment given before surgery in patients with soft tissue sarcoma. 