The main symptom of rectus abdominis leiomyosarcoma, or fibroma of the rectus abdominis muscle, is a painless lump under the skin, and the main treatment is surgery. Rectus abdominis myofibroma, is a benign tumor from muscle fiber tissue. It is mostly found under the skin and can be seen in many parts of the body, preferably in the rectus abdominis muscle of the abdominal wall. Its main symptom is a painless subcutaneous mass, which is usually slow-growing, painless, well-demarcated from the surrounding tissues, and hard, and some patients may also have digestive symptoms, such as dyspepsia, vomiting, and so on. Most of rectus abdominis fibroma is benign, but some of them will be malignant, so once found, it should be surgically removed in time. Rectus abdominis fibroma should be treated promptly.