Nasolacrimal duct obstruction

Nasolacrimal duct obstruction
Nasolacrimal duct obstruction
Other names	Dacryocystitis
	Tear system consists of lacrimal gland (a), punctums (b,e), canalicules (c,f), lacrimal sac (d). Tear is then drained through nasolacrimal duct (g) into nasal cavity
Specialty	Ophthalmology
Differential diagnosis	Tears arising from lacrimal sac fistula.

Nasolacrimal duct obstruction is the obstruction of the nasolacrimal ducts (better known as the tear ducts) and may be either congenital or acquired. Obstruction of the nasolacrimal ducts leads to the excess overflow of tears called epiphora.^[2]

^ Nerad, Jeffrey A.; Carter, Keith D.; Alford, Mark (2008). "Disorders of the Lacrimal System: Congenital Obstruction". Oculoplastic and Reconstructive Surgery. Elsevier. pp. 131–137. doi:10.1016/b978-0-323-05386-0.50010-7. ISBN 978-0-323-05386-0. This tearing is different (from Dacryocystitis), as it originates from the fistula located below the eyelid on the cheek (may be associated with nasolacrimal duct obstruction).
^ Cite error: The named reference yanoff was invoked but never defined (see the help page).

[Nerad_Carter_Alford_2008_pp._131–137-1] Nerad, Jeffrey A.; Carter, Keith D.; Alford, Mark (2008). "Disorders of the Lacrimal System: Congenital Obstruction". Oculoplastic and Reconstructive Surgery. Elsevier. pp. 131–137. doi:10.1016/b978-0-323-05386-0.50010-7. ISBN 978-0-323-05386-0. This tearing is different (from Dacryocystitis), as it originates from the fistula located below the eyelid on the cheek (may be associated with nasolacrimal duct obstruction).

[yanoff-2] Cite error: The named reference yanoff was invoked but never defined (see the help page).

[1]

[2]