Lymphoma is often found on ultrasound in enlarged lymph nodes, especially those larger than 2 cm in diameter. However, ultrasound alone cannot identify whether the enlarged lymph nodes are malignant lymphoma or reactive hyperplasia, or chronic inflammation. When there is lymphoma infiltration in the liver or spleen, ultrasound will also reveal enlargement of the liver and spleen, and in some cases, obvious tumor nodules in the liver and spleen. In some patients with lymphoma, if a laparotomy is to be performed, preoperative ultrasound is also usually required. Ultrasound can assist in the diagnosis of abdominal cavity lesions, especially for diagnosing whether the lymph nodes adjacent to the aorta are lymphoma or not.