Abstract
DELAY in canalization of the naso-lacrimal duct is by no means uncommon, and is often associated with chronic dacryocystitis. Guerry and Kendig (1949) found 6 per cent. impatency of the duct in full-term infants, and Cassady (1948) found an imperforate membrane at birth in 84 per cent. of infants, although this usually ruptured before the onset of tears at about 31 weeks. In a further series of full-term foetuses (Cassady, 1952), he found an instance of 73 per cent. imperforate membrane at the lower end of the naso-lacrimal duct. Encysted mucocele at birth is, however, very rare. Becker (1938) found two cases in a series of 250 infants over a period of 10 years.
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