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Case 136

A 87-year-old male with a pigmented skull lesion


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1.What is the diagnosis?

A: compound nevus

B: blue nevus

C: malignant melanoma, superficial spreading type

D: dysplastic nevus


Answer

The correct answer is C. It's a case of malignant melanoma, superficial spreading type.


superficially invasive melanoma

  • Often show:

    • High-level and/or extensive pagetoid scatter

    • Extensive, continuous basal (lentiginous) proliferation of atypical melanocytes

    • More severe and uniform cytologic atypia

    • Mitotic activity

    • Lack of maturation in the dermal component

Case credit: UCSD Pathology

Author: Wangpan Jackson Shi, MD

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