Figure 535

Malignant melanoma.

individuals or broadening of an existing band in people of African or Asian descent. This tumour and its practical differential diagnosis from other chromonychias and nail dystrophies is described in this section; linear melanonychia from other causes is considered in Chapter 7.

Melanoma of the nail region is now better understood since the identification and analysis of acrolentiginous melanoma. It may be localized subungually or periungually with pigmentation and/or dystrophy of the nail plate (Figure 5.35). Initial lesions may be mistaken histologically for benign or atypical melanocytic hyperplasia, but serial sections usually reveal the true nature of the disease.

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