malignant blue nevus

(redirected from atypical blue nevus)

malignant blue nevus

A rare skin lesion that usually involves the scalp, presents as a multinodular plaque > 2.0 cm with a history of progressive enlargement, is often associated with a cellular blue nevus, and is histologically characterised by sheet-like growth pattern, mitoses, necrosis and marked cellular atypia. The behaviour of malignant blue nevi is unpredictable. 

The late AB Ackerman held that atypical blue nevus, malignant blue nevus, and metastasizing blue nevus are evasive terms for what should be called melanoma.

malignant blue nevus

A rare skin lesion that usually involves the scalp, presents as a multinodular plaque > 2.0 cm, a Hx of progressive enlargement, often associated with a cellular blue nevus; MBN's behavior is unpredictable. See Blue nevus, Melanoma.
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We discuss salient clinical and pathologic features of blue nevi, with emphasis on the most diagnostically challenging aspects involving recognition of some rare variants and differential diagnosis between atypical blue nevus and malignant blue nevus.