A 35-year-old woman notices a change in the appearance of a…
A 35-year-old woman notices a change in the appearance of a mole on her neck. Physical examination reveals that the lesion is an irregular nodular superficial mass with a variegated appearance. Biopsy demonstrates a primary malignant tumor. What characteristic of the malignant skin lesion is most predictive of the patient’s long-term prognosis?
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