Natural history of squamous cell carcinoma of the skin: case report.

Squamous cell carcinoma is a malignant proliferation of the epidermal keratinocyte. With early recognition and treatment, most of these tumors have a favorable prognosis. If the lesions are left untreated, however, the results may prove fatal. We describe a case of long-standing neglect of cutaneous squamous cell carcinoma leading to widely metastatic disease in a 69-year-old man.