Inflammation of the lacrimal sac (the tear-collecting pouch), usually caused by infection or blockage.
From Greek 'dakryon' (tear) + 'kystis' (sac) + '-itis' (inflammation). This is one of the most common terms in the dacry- family of eye diseases.
Dacryocystitis is super common in newborns when their tear ducts are blocked—it's why some babies have gunky, watery eyes, and it usually clears up on its own!
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