{"title":"Malignant blue melanoma.","authors":"Yo Kaku, Arnaud de la Fouchardière","doi":"10.1016/j.clindermatol.2024.09.002","DOIUrl":null,"url":null,"abstract":"<p><p>Malignant blue melanomas arise from blue nevi and all related intradermal melanocytic proliferations. They harbor specific, mutually exclusive mutations in the G-coupled protein pathway, mainly involving GNAQ or GNA11. Other rare genetic drivers include CYSLTR2 or PCLB4 mutations. PKC and GRM1-gene fusions have been recently added to this list. Malignant blue melanomas have a predilection for the scalp area, presenting as rapidly growing nodules within a pre-existing lesion. Histopathologically, these tumors are located in the dermis and subcutaneous fat and consist of large nodules or expanding dense sheets. Tumor necrosis is commonly seen. Large spindle-shaped and epithelioid melanocytes with high-grade cytologic atypia and frequent mitotic figures are at higher magnification. A benign blue nevus or intermediate-grade blue melanocytoma is frequently found on the side of the central mass. Loss of nuclear BAP1 immunoreactivity is a poor prognostic factor.</p>","PeriodicalId":10358,"journal":{"name":"Clinics in dermatology","volume":" ","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Clinics in dermatology","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1016/j.clindermatol.2024.09.002","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"DERMATOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Malignant blue melanomas arise from blue nevi and all related intradermal melanocytic proliferations. They harbor specific, mutually exclusive mutations in the G-coupled protein pathway, mainly involving GNAQ or GNA11. Other rare genetic drivers include CYSLTR2 or PCLB4 mutations. PKC and GRM1-gene fusions have been recently added to this list. Malignant blue melanomas have a predilection for the scalp area, presenting as rapidly growing nodules within a pre-existing lesion. Histopathologically, these tumors are located in the dermis and subcutaneous fat and consist of large nodules or expanding dense sheets. Tumor necrosis is commonly seen. Large spindle-shaped and epithelioid melanocytes with high-grade cytologic atypia and frequent mitotic figures are at higher magnification. A benign blue nevus or intermediate-grade blue melanocytoma is frequently found on the side of the central mass. Loss of nuclear BAP1 immunoreactivity is a poor prognostic factor.
期刊介绍:
Clinics in Dermatology brings you the most practical and comprehensive information on the treatment and care of skin disorders. Each issue features a Guest Editor and is devoted to a single timely topic relating to clinical dermatology.
Clinics in Dermatology provides information that is...
• Clinically oriented -- from evaluation to treatment, Clinics in Dermatology covers what is most relevant to you in your practice.
• Authoritative -- world-renowned experts in the field assure the high-quality and currency of each issue by reporting on their areas of expertise.
• Well-illustrated -- each issue is complete with photos, drawings and diagrams to illustrate points and demonstrate techniques.