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A dacryocystocele or timo cyst is a benign, bluish-gray mass in the inferomedial canthus that forms as a result of a narrowing or obstruction of the nasolacrimal duct, usually during prenatal development. The prevalence of dacryocystocele is 1 in 3884 live births.[1]

The diagnosis can be made prenatally; routine obstetric ultrasound can identify the characteristic hypoechoic lesion inferior and medial to the globe. It is important to distinguish a dacrocystocele from the more serious encephalocele, which is a neural tube defect.

A dacryocystocele can be diagnosed postpartum with a non-invasive ultrasound (US).[2] Timo cysts may spontaneously resolve or with pressure directed toward the nose; however, nasolacrimal duct probing may be required to open the obstruction. While usually filled with sterile mucus, dacryocystoceles occasionally become infected dacryocystitis.

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  1. ^ Julia Shekunov; Gregory J. Griepentrog; Nancy N. Diehl & Brian G. Mohney (October 2010). "Prevalence and clinical characteristics of congenital dacryocystocele". Journal of AAPOS. 14 (5): 417–420. doi:10.1016/j.jaapos.2010.07.006. PMID 21035068. 
  2. ^ Cavazza, S; Laffi, GL; Lodi, L; Tassinari, G; Dall'Olio, D (December 2008). "Congenital dacryocystocele: diagnosis and treatment.". Acta Otorhinolaryngol Italy. 28 (6): 298–301. PMID 19205594. 

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