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The nasolacrimal duct system is a complex structure responsible for the drainage of tears from the eye into the nasal cavity. Nasolacrimal duct obstruction is a common condition that affects both children and adults, causing symptoms such as epiphora (excessive tearing), dacryocystitis (infection of the nasolacrimal sac), and eyelid swelling. The obstruction can be caused by various factors, including congenital anomalies, trauma, infection, and inflammation.