"Nasolacrimal drainage apparatus obstruction results in epiphora and can be primary or secondary, congenital or acquired. Obstruction can occur at canalicular, lacrimal saccular, or nasolacrimal ductal (post-saccular) levels."
"primary acquired nasolacrimal duct obstruction (PANDO)"
Expected headings
"Congenital obstruction"
"Acquired obstruction"
"Nasolacrimal drainage apparatus obstruction results in epiphora and can be primary or secondary, congenital or acquired. Obstruction can occur at canalicular, lacrimal saccular, or nasolacrimal ductal (post-saccular) levels."