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5525 Pathology

A 74-year-old woman has noted increasing size and number of darker brown patches on the dorsum of each hand for the past 15 years. They do not change with sun exposure, are nonpruritic, and non-tender. On examination, these 0.5- to 1-cm lightly pigmented lesions are flat. Which of the following is the most likely microscopic finding in these lesions?

ABasal melanocytic hyperplasia
BDermal nevus cells
CLoss of melanin in surrounding skin
DMast cell proliferation
Pathology
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