{"id":6859,"date":"2026-05-04T16:12:17","date_gmt":"2026-05-04T13:12:17","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/effet-de-masse\/"},"modified":"2026-06-01T13:04:51","modified_gmt":"2026-06-01T10:04:51","slug":"effet-de-masse","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/effet-de-masse\/","title":{"rendered":"Effet de masse"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Effet de masse (du mot anglais <em>mass<\/em> \u2014 masse, volume et <em>effect<\/em> \u2014 r\u00e9sultat, effet) \u2014 c&rsquo;est un terme radiologique et clinique utilis\u00e9 pour d\u00e9crire le d\u00e9placement, la d\u00e9formation et la compression physique pathologique des structures c\u00e9r\u00e9brales saines par toute formation volumique suppl\u00e9mentaire.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\"><strong>\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">Puisque la bo\u00eete cr\u00e2nienne d&rsquo;un adulte ne peut pas s&rsquo;\u00e9tendre, l&rsquo;apparition de tout volume suppl\u00e9mentaire (h\u00e9matome volumineux, tumeur, abc\u00e8s ou zone de forte \u0153d\u00e8me) n\u00e9cessite in\u00e9vitablement la cr\u00e9ation d&rsquo;espace. Un volume pathologique commence \u00e0 agir comme une presse.<\/p>\n\n<p class=\"wp-block-paragraph\">Tout d&rsquo;abord, il \u00e9vacue les liquides (liquide c\u00e9phalorachidien et le sang veineux) de la cavit\u00e9 cr\u00e2nienne. Une fois cette r\u00e9serve \u00e9puis\u00e9e, le volume commence \u00e0 d\u00e9former le tissu c\u00e9r\u00e9bral lui-m\u00eame. Les structures saines se d\u00e9placent dans la direction oppos\u00e9e, les rep\u00e8res m\u00e9diaux du cerveau se d\u00e9forment, et les ventricules internes (cavit\u00e9s fluides) sont \u00e9cras\u00e9s et ferm\u00e9s.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\"><strong>Importance clinique<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">La pr\u00e9sence et l&rsquo;intensit\u00e9 de l&rsquo;effet de masse \u2014 le crit\u00e8re principal \u00e9valu\u00e9 par le radiologue lors de l&rsquo;interpr\u00e9tation d&rsquo;une tomodensitom\u00e9trie. Il est mesur\u00e9 en millim\u00e8tres en fonction du degr\u00e9 de d\u00e9placement des soi-disant structures m\u00e9dianes du cerveau (par exemple, le septum lucidum ou la glande pin\u00e9ale).<\/p>\n\n<p class=\"wp-block-paragraph\">Cliniquement, l&rsquo;effet de masse se manifeste par des maux de t\u00eate croissants, des sympt\u00f4mes neurologiques focaux et une alt\u00e9ration de la conscience. Un d\u00e9placement des structures m\u00e9dianes de plus de 5 \u00e0 7 mm est consid\u00e9r\u00e9 comme critique et, en r\u00e8gle g\u00e9n\u00e9rale, constitue une indication directe pour une intervention chirurgicale d&rsquo;urgence afin d&rsquo;\u00e9liminer le volume pathologique et de sauver la vie du patient.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Effet de masse (du mot anglais <em>mass<\/em> \u2014 masse, volume et <em>effect<\/em> \u2014 r\u00e9sultat, effet) \u2014 c&rsquo;est un terme radiologique et clinique utilis\u00e9 pour d\u00e9crire le d\u00e9placement, la d\u00e9formation et la compression physique pathologique des structures c\u00e9r\u00e9brales saines par toute formation volumique suppl\u00e9mentaire.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6859","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO 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