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Blue nevus (also known as "blue neuronevus," "dermal melanocytoma," and "nevus bleu") is a type of melanocytic nevus. The blue colour is caused by the pigment being deeper in the skin than in ordinary nevi. In principle they are harmless〔(【引用サイトリンク】title=Blue naevus (nevus). DermNet NZ )〕 but they can sometimes be mimicked by malignant lesions, i.e. some melanomas can look like a blue nevus. ==Classification== Blue nevi may be divided into the following types: * A ''patch blue nevus'' (also known as an "acquired dermal melanocytosis," and "dermal melanocyte hamartoma") is a cutaneous condition characterized by a diffusely gray-blue area that may have superimposed darker macules.〔 * A ''blue nevus of Jadassohn–Tièche'' (also known as a "common blue nevus," and "nevus ceruleus") is a cutaneous condition characterized by a steel-blue papule or nodule.〔 * A ''cellular blue nevus'' is a cutaneous condition characterized by large, firm, blue or blue-black nodules.〔 * An ''epithelioid blue nevus'' is a cutaneous condition most commonly seen in patients with the Carney complex.〔 * A ''deep penetrating nevus'' is a type of benign melanocytic skin tumor characterized, as its name suggests, by penetration into the deep dermis and/or subcutis. Smudged chromatic is a typical finding. In some cases mitotic figures or atypical melanocytic cytology are seen, potentially mimicking a malignant melanoma. Evaluation by an expert skin pathologist is advisable in some cases to help differentiate from invasive melanoma.〔 * An ''amelanotic blue nevus'' (also known as a "hypomelanotic blue nevus") is a cutaneous condition characterized by mild atypia and pleomorphism.〔 * A ''malignant blue nevus'' is a cutaneous condition characterized by a sheet-like growth pattern, mitoses, necrosis, and cellular atypia.〔〔 SkinTumors-415.jpg|Cellular blue nevus SkinTumors-408.jpg|Nevus coeruleus SkinTumors-456.jpg|Epithelioid blue nevus Skin Tumors-P6231211.jpg|Malignant blue nevus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blue nevus」の詳細全文を読む スポンサード リンク
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