Unknown Melanocytic Lesion #1

    A 16 year-old female presents with a blue-black nodule on the medial aspect of the right ankle measuring 1 cm in diameter.  The patient has no familial history of skin cancer.


    Clinical differential diagnosis:

    1. Blue nevus

    2. Dysplastic nevus

    3. Malignant Melanoma

    What is your diagnosis? (Pathologic differential diagnoses):

    a) Pigmented epithelioid melanocytoma

    b) Cellular blue nevus

    c) Malignant blue nevus

    d) Epithelioid (Spitz) cell nevus

    e) Regressed vertical growth phase melanoma