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- Presentation
The Most Important Rules Not to Miss Nail Melanoma
Description
The presentation focuses on the crucial distinctions in diagnosing nail melanocytic lesions, including melanositic activation versus melanositic proliferation, emphasizing the importance of age in pediatric cases. Melanositic activation can occur due to various factors such as trauma or chronic conditions and is characterized by gray pigmentation, while melanomas appear brown and exhibit specific features like Hutchinson's sign or varying colors. Key diagnostic rules include monitoring the pigmentation extent and changes over time, as well as cautious biopsy thresholds in children due to the rarity of melanoma in this demographic. Examples of cases highlight the significance of clinical features and dermatoscopy techniques in differentiating between benign melanocytic nevi and malignant melanoma, urging clinicians to remain vigilant for atypical presentations. The speaker discusses pitfalls in diagnosis, particularly the misinterpretation of histological findings, and stresses the need for deeper evaluation of suspected melanomas. The significance of proper follow-up, especially in pediatric patients, is highlighted as critical to avoid unnecessary procedures while ensuring any cancerous changes are promptly identified.
View moreConclusions
- Melanocytic activation differs from melanositic proliferation, with activation conditions including pregnancy, chronic trauma, and drug use.
- Grey structureless bands indicate melanositic activation, while brown parallel lines indicate melanositic lesions such as nevi or melanoma.
- In pediatric patients, melanoma is exceedingly rare, and most cases are reported after puberty.
- Biopsy thresholds should be high in pediatric patients due to the rarity of nail melanoma and the possibility of lesions being benign.
- In cases of suspicious nail pigmentation, follow-up and observation are often better management strategies than immediate biopsy.
- A more than 2/3 involvement of the nail plate significantly increases the risk of melanoma in adults, but this criterion does not apply to children.
- Features such as abrupt changes in pigmentation and chaotic dermatoscopic patterns suggest malignancy in adults and children alike.
- Congenital nevi typically do not transform into melanoma, and distinguishing these lesions can allow for reduced follow-up intensity.
- Diagnostic pitfalls must be recognized, particularly distinguishing between benign conditions and melanoma, which can be obscured by treatments such as antifungal therapies.
- J Am Acad Dermatol. 2022 Sep;87(3):551-558. doi: 10.1016/j.jaad.2022.01.028. Epub 2022 Jan 29.
- Akay BN, Kirmizi A, Bostanci S, Okcu Heper A, Farabi B. Paediatric melanoma of the nail unit with rapid progression: a case report with dermatoscopic follow-up and intraoperative dermatoscopic images. Australas J Dermatol. 2020 Feb;61(1):46-48. doi: 10.1111/ajd.13182. Epub 2019 Oct 24.