{"id":4803,"date":"2016-01-15T09:35:12","date_gmt":"2016-01-15T09:35:12","guid":{"rendered":"http:\/\/old.institutcataladelpeu.com\/ca\/?p=4803"},"modified":"2016-03-10T11:15:17","modified_gmt":"2016-03-10T11:15:17","slug":"la-melanoniquia-unguial-conceptes-basics","status":"publish","type":"post","link":"https:\/\/old.institutcataladelpeu.com\/ca\/la-melanoniquia-unguial-conceptes-basics\/","title":{"rendered":"La melanon\u00edquia unguial. Conceptes b\u00e0sics"},"content":{"rendered":"<p>La melanon\u00edquia cursa amb una banda longitudinal de pigmentaci\u00f3 marr\u00f3 o grisenca en la l\u00e0mina unguial a causa de la pres\u00e8ncia de melanina en aquesta. Normalment, afecta una sola ungla, encara que en individus de pell fosca pot presentar-se de forma m\u00faltiple per l\u2019activaci\u00f3 de melan\u00f2cits benignes.<\/p>\n<p>Les causes s\u00f3n multifactorials tals com el nevus a nivell de la matriu unguial, traumatismes, l\u2019embar\u00e0s, la malaltia d\u2019Addison, medicaments, d\u00e8ficit de vitamina B12, desnutrici\u00f3, etc.<\/p>\n<p>Les pigmentacions mel\u00e0niques poden presentar una banda de pigmentaci\u00f3 grisa associada generalment a casos de lentigen, farmacol\u00f2gics o motius \u00e8tnics.<\/p>\n<p>L\u2019activaci\u00f3 de melan\u00f2cits per medicaments comporta l\u2019aparici\u00f3 en diverses ungles de peus i mans entre un i dos mesos de l\u2019administraci\u00f3 del medicament, mentre que la pigmentaci\u00f3 d\u2019origen \u00e8tnic \u00e9s com\u00fa en ra\u00e7a negra i individus del sud d\u2019Europa.<\/p>\n<p>En el cas que la banda pigmentada sigui de color marr\u00f3, hem d\u2019observar si presenta un aspecte regular (t\u00edpic en nevus) o irregular (t\u00edpic en melanomes).<\/p>\n<p>El color marr\u00f3 \u00e9s causat per una hiperpigmentaci\u00f3 amb augment del nombre i funci\u00f3 de melan\u00f2cits. En canvi, el color gris de la banda es produeix per una hiperpigmentaci\u00f3 epitelial sense hiperpl\u00e0sia melanoc\u00edtica.<\/p>\n<p>La banda marr\u00f3 de pigment \u00e9s conseq\u00fc\u00e8ncia d\u2019una tumoraci\u00f3 benigna o maligna. La tumoraci\u00f3 benigna pot ser conseq\u00fc\u00e8ncia d\u2019un nevus de la matriu amb aspecte d\u2019una banda composta de l\u00ednies paral\u00b7leles regulars i homog\u00e8nies. \u00c9s el 12% de causa en individus adults i fins a un 50% en nens. Els nevus solen apar\u00e8ixer en persones joves; s\u00f3n cong\u00e8nits o adquirits. En nens amb nevus en la matriu unguial, cal controlar la variaci\u00f3 de l\u2019amplitud i coloraci\u00f3 de la banda.<\/p>\n<p>La tumoraci\u00f3 maligna s\u2019associa al melanoma amb una banda irregular amb policromia i l\u00ednies amples polimorfes. En fases prim\u00e0ries, el melanoma sol ser asimptom\u00e0tic i evoluciona a distr\u00f2fia unguial, n\u00f2duls i ulceracions. Els melanomes subunguials poden crear confusi\u00f3 en ocasions o granulomes piog\u00e8nics. El signe de Hutchinson presenta pigmentaci\u00f3 de la pell periunguial i representa la fase de desenvolupament del melanoma. El signe de Hutchinson no \u00e9s \u00fanic del melanoma, per\u00f2 la seva aparici\u00f3 precisa una bi\u00f2psia.<\/p>\n<p>Es recomana biopsiar en la melanon\u00edquia longitudinal per con\u00e8ixer exactament el diagn\u00f2stic de la matriu i descartar el melanoma, sobretot en casos d\u2019aparici\u00f3 brusca, canvis de color o d\u2019ample de la banda, aix\u00ed com en antecedents de melanoma.<\/p>\n<p>El melanoma sol afectar un dit, progressa r\u00e0pidament, augmenta la pigmentaci\u00f3 de la banda longitudinal i apareix majorit\u00e0riament a partir dels 50 anys.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 12%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-4803 gallery-columns-8 gallery-size-full'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/old.institutcataladelpeu.com\/wp-content\/uploads\/2016\/03\/melanoniquia71.jpg'><img  title=\"La melanon\u00edquia unguial. 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Conceptes b\u00e0sics\"  srcset=\"https:\/\/old.institutcataladelpeu.com\/wp-content\/uploads\/2016\/03\/DSC04621-melanoniquia8-copia.jpg 685w, https:\/\/old.institutcataladelpeu.com\/wp-content\/uploads\/2016\/03\/DSC04621-melanoniquia8-copia-380x285.jpg 380w, https:\/\/old.institutcataladelpeu.com\/wp-content\/uploads\/2016\/03\/DSC04621-melanoniquia8-copia-450x338.jpg 450w\" sizes=\"auto, (max-width: 685px) 100vw, 685px\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>La melanon\u00edquia cursa amb una banda longitudinal de pigmentaci\u00f3 marr\u00f3 o grisenca en la l\u00e0mina unguial a causa de la pres\u00e8ncia de melanina en aquesta. Normalment, afecta una sola ungla, encara que en individus de pell fosca pot presentar-se de forma m\u00faltiple per l\u2019activaci\u00f3 de melan\u00f2cits benignes. Les causes s\u00f3n multifactorials tals com el nevus [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":4814,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[276],"tags":[],"class_list":["post-4803","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alteracions-dermatologiques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La melanon\u00edquia unguial. Conceptes b\u00e0sics - Institut Catal\u00e0 del Peu<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La melanon\u00edquia unguial. Conceptes b\u00e0sics - Institut Catal\u00e0 del Peu\" \/>\n<meta property=\"og:description\" content=\"La melanon\u00edquia cursa amb una banda longitudinal de pigmentaci\u00f3 marr\u00f3 o grisenca en la l\u00e0mina unguial a causa de la pres\u00e8ncia de melanina en aquesta. Normalment, afecta una sola ungla, encara que en individus de pell fosca pot presentar-se de forma m\u00faltiple per l\u2019activaci\u00f3 de melan\u00f2cits benignes. Les causes s\u00f3n multifactorials tals com el nevus [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/old.institutcataladelpeu.com\/ca\/la-melanoniquia-unguial-conceptes-basics\/\" \/>\n<meta property=\"og:site_name\" content=\"Institut Catal\u00e0 del Peu\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/institutcataladelpeu\/\" \/>\n<meta property=\"article:published_time\" content=\"2016-01-15T09:35:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2016-03-10T11:15:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/old.institutcataladelpeu.com\/wp-content\/uploads\/2016\/01\/melanoniquia_ungeal.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Miguel \u00c1ngel Ba\u00f1os Bernad\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ICPeu\" \/>\n<meta name=\"twitter:site\" content=\"@ICPeu\" \/>\n<meta name=\"twitter:label1\" content=\"Escrit per\" \/>\n\t<meta name=\"twitter:data1\" content=\"Miguel \u00c1ngel Ba\u00f1os Bernad\" \/>\n\t<meta name=\"twitter:label2\" content=\"Temps estimat de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuts\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/old.institutcataladelpeu.com\\\/ca\\\/la-melanoniquia-unguial-conceptes-basics\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/old.institutcataladelpeu.com\\\/ca\\\/la-melanoniquia-unguial-conceptes-basics\\\/\"},\"author\":{\"name\":\"Miguel \u00c1ngel Ba\u00f1os Bernad\",\"@id\":\"https:\\\/\\\/old.institutcataladelpeu.com\\\/en\\\/#\\\/schema\\\/person\\\/d2ccc8088f9445f3e2758c2a60caf354\"},\"headline\":\"La melanon\u00edquia unguial. 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