Resumo
Objetivo: Relatar um caso raro de amiloidoma multifocal extenso, com acometimento da base do crânio, rinofaringe e extensão intra-orbitária, enfatizando os critérios de imagem que contribuíram para o diagnóstico diferencial frente a lesões neoplásicas. Detalhamento do caso: Paciente, 66 anos, apresentou perda visual progressiva culminando em cegueira bilateral. A investigação por Ressonância Magnética (RM) revelou volumosa lesão expansiva extra-axial em base do crânio e órbita, com realce heterogêneo e hipossinal em T2, achados que mimetizavam um meningioma. O diagnóstico definitivo foi estabelecido por biópsia endoscópica da rinofaringe, que demonstrou deposição de amiloide com positividade para Vermelho Congo, confirmando um amiloidoma. Considerações finais: O caso sublinha o desafio do diagnóstico diferencial radiológico e a necessidade de alto índice de suspeição para incluir a amiloidose em lesões complexas de base do crânio. O reconhecimento dos padrões atípicos de imagem é crucial, e a confirmação histopatológica por biópsia de baixo risco foi fundamental para evitar uma intervenção neurocirúrgica de alta morbidade.
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