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