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Tests and procedures used to diagnose Merkel cell carcinoma include:
Your doctor may use the following tests to help determine whether the cancer has spread beyond your skin:
Sentinel node biopsy. A sentinel node biopsy is a procedure to determine whether cancer has spread to your lymph nodes. This procedure involves injecting a dye near the cancer. The dye then flows through the lymphatic system to your lymph nodes.
The first lymph node that receives the dye is called the sentinel node. Your doctor removes this lymph node and looks for cancerous cells under a microscope.
Imaging tests. Your doctor may recommend a chest X-ray and a CT scan of your chest and abdomen to help determine whether the cancer has spread to other organs.
Your doctor may also consider other imaging tests such as a positron emission tomography (PET) scan or an octreotide scan - a test that uses an injection of a radioactive tracer to check for the spread of cancer cells.
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