Metastatic squamous cell carcinoma in the armpit of a male patient. This form of skin cancer arises from squamous cells, flat scale-like cells in the
Metastatic squamous cell carcinoma in the armpit of a male patient. This form of skin cancer arises from squamous cells, flat scale-like cells in the upper layers of the skin. The tumour forms interconnecting bands of keratinised cells that invade the surrounding tissue. Squamous cell carcinoma is the second most common form of skin cancer. Most cases arise from pre-cancerous lesions known as solar keratoses, which are caused by sun damage. It mostly affects the elderly. Secondary (metastatic) cancers are ones that have spread from the primary site (here, on the chest, excised two years earlier). The prognosis for secondary cancers is usually poor.
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