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Table 6 The ABCDE of nail melanoma after Levit [39]

From: Clinical guidelines for the recognition of melanoma of the foot and nail unit

A Age Range 20-90, peak 5th -7th decades.
B Band (nail band): Pigment (brown-black). Breadth > 3 mm. Border (irregular/blurred).
C Change: rapid increase in size/growth rate of nail band. Lack of change: failure of nail dystrophy to improve despite adequate treatment.
D Digit Involved: Thumb > hallux > index finger > single digit > multiple digits.
E Extension: Extension of pigment to involve proximal or lateral nail fold (hutchinson's sign) or free edge of nail plate.
F Family or personal history: Of previous melanoma or dysplastic nevus.