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Diagnostic imaging is used to evaluate for evidence of metastatic disease as part of the staging process. Three‐view thoracic radiographs or CT are used most commonly to evaluate for pulmonary metastases and thoracic lymph node involvement, and abdominal ultrasonography or CT for evaluation of abdominal lymph nodes and intraabdominal metastases.

Imaging of the primary cutaneous mass, using ultrasonography, CT, or magnetic resonance imaging, provides detail on the degree of local invasion, particularly at the deep margin that facilitates appropriate surgical anatomical margin planning. This is particularly important when major reconstructive procedures are required to achieve local tumor control. Examples of skin tumors where this is particularly useful are those overlying the thoracic cavity, head and neck or pelvis, and any other area with important anatomical structures (Figure 4.1).