The majority of<unk>  cell carcinomas arise on the sun-exposed areas of the skin on the head and neck, with fewer lesions arising on the extremities and the trunk. The early lesions of<unk>  cell carcinoma frequently present as a red, scaly spots while later lesions may form nodules or firm plaques, either of which can ulcerate ( http://tray.dermatology.uiowa.edu). Diagnosis is established by performing a biopsy and the obtaining histopathological confirmation. Complete excision is curative in the vast majority of cases, however occasionally<unk>  cell carcinoma will invade along the perineural layer of peripheral nerves and will extend well beyond the<unk> ly apparent mass. Local recurrence is more common in these instances and when occurring on the head, may cause direct intracranial extension. Metastases to draining lymph nodes occurs in a minority of cases and disseminated disease is the cause of most<unk>  cell carcinoma-related deaths. Higher rates of metastasis (~15%) are observed with primary lesions of the lips or ears (Rowe et al., 1992). Radiation therapy is helpful in some cases of locally recurrent disease in which complete resection is difficult to achieve.
Squamous cell carcinoma clinical features
Mucoepidermoid carcinoma risk factors
Mucoepidermoid carcinoma other imaging findings
Basal cell carcinoma other diagnostic studies
Basal cell carcinoma differential diagnosis
Fibroma other imaging findings
Mucoepidermoid carcinoma differential diagnosis
Merkel cell cancer other imaging findings