Obstruction of the lacrimal ducts is normally total, unilateral, and sited at the valve of Krause. The obstruction of this valve predominantly affects women, whereas obstruction of the valve of Hasner mainly affects men. There was no significant difference in the distribution of obstructions by age group.
The authors perform a revisional and iconographic study of the lacrimal system by means of radiological methods, namely, conventional radiography, linear tomography, computed tomography and magnetic resonance imaging. Image methods are essential to define diagnosis and therapy, considering that besides demonstrating alterations of the lacrimal system, they may indicate the patients with better prognosis associated with the surgical approach. Considering the lower cost, lower radiation dose, low rate of complications, and level of information that can be obtained dacryocystography by means of linear tomography is recommended as the initial investigation method. Keywords: Dacryocystography; Lacrimal system; Obstruction of the lacrimal system. Avaliação da via lacrimal pelos métodos radiológicos.Os autores realizam um estudo revisional e iconográfico das vias lacrimais através dos métodos radiológi-cos, sendo eles a radiografia convencional, a tomografia linear, a tomografia computadorizada e a ressonân-cia magnética. Os métodos de imagem são fundamentais para definir diagnóstico e terapia, pois, além de demonstrarem as alterações das vias lacrimais, sugerem quais os pacientes que terão melhor prognóstico com a abordagem cirúrgica. Pelo seu custo mais baixo, menor dose de radiação, baixo índice de complicações e pela informação que pode ser obtida, recomenda-se que a dacriocistografia por tomografia linear seja o método inicial de investigação. Unitermos: Dacriocistografia; Via lacrimal; Obstrução da via lacrimal. AbstractResumo
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