The examinations that can be done to suspect malignant melanoma has metastasis include imaging examination of superficial lymph nodes, chest, abdomen, skull and other parts of the body. 1. Ultrasound: ultrasound examination can be used to diagnose lymph node metastasis of malignant melanoma, and the examination sites include neck, supraclavicular, axilla, groin, etc. In the image of lymph node metastasis, strings or individual enlarged lymph nodes can be seen, with irregular shape, unclear blood vessels of lymph nodes’ dermatomedullary substance, uneven surface, and ultrasound shows that the blood flow is of high speed and high obstruction type. 2. Chest imaging examination: including chest X-ray film, chest CT, the examination can see the mass, round or spherical lesions, which are often irregular in shape, with burrs or lobes. 3. Abdominal imaging examination: commonly performed examination includes abdominal ultrasound, abdominal CT, liver MRI, imaging liver metastatic cancer MRI or CT can show giant, nodular and diffuse type, and low-density mass can appear in the image. 4. Head imaging: including head CT, head magnetic resonance, PET/CT whole body examination, the examination can show low density or mixed density shadow in the cranium and brain, the boundary is usually unclear and irregular in shape, and there will be obvious enhancement of the lesion when doing enhanced CT or enhanced magnetic resonance examination. Malignant melanoma mainly metastasizes through lymphatic channels, and can also metastasize to lungs, liver, brain and other parts of the body through blood line, so the imaging examination of these parts of the body has diagnostic significance, and the patient should not judge or diagnose the disease based on the result of a single examination, but should consult the doctor in time, and the doctor will analyze the disease comprehensively and diagnose the disease according to the specific situation.