Malignant tumor in muscle can be examined by physical examination, ultrasound, MRI, puncture biopsy and so on. 1. Physical examination: Physical examination is the simplest and most commonly used examination method. When there is malignant tumor in muscle, a mass may be detected locally, and the boundary is not clear, sometimes accompanied by local tissue swelling and pressure pain. 2. Ultrasound: ultrasound is inexpensive, relatively fast, and is a common means of initial screening for intramuscular malignant tumors, capable of determining the size, scope, and infiltration depth of the tumor. It can determine the size, scope and infiltration depth of the tumor. It can also be used for puncture biopsy under the guidance of ultrasound. 3. Nuclear magnetic resonance (MRI): MRI is one of the most important screening methods for intramuscular malignant tumors, which can clearly observe the tumor size, invasion range, relationship with surrounding tissues, blood supply and so on. 4. Puncture biopsy: Puncture biopsy can extract the tumor tissue for pathological examination to further clarify the nature of the tumor and pathological type, which will provide the basis for the development of the next treatment plan. Patients who find localized swelling and suspect muscle malignant tumor are recommended to go to the hospital as soon as possible, ask professional doctors to evaluate their conditions, choose appropriate examination methods to make a clear diagnosis as soon as possible, and give targeted treatment in a timely manner.