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If the external orifice becomes occluded, there results a dermoid cyst. Tubulo-dermoids arise from embryonic ducts and passages that are normally obliterated at birth, for example, lingual dermoids develop in relation to the thyreo-glossal duct; rectal and post-rectal dermoids to the post-anal gut; and branchial dermoids in relation to the branchial clefts.
Percy reports an instance in which semen was found issuing from the os uteri eight and one-half days after the last intercourse; and a microscopic examination of this semen revealed the presence of living as well as dead spermatozoa. We have occasional instances of impregnation by rectal coitus, the semen finding its way into an occluded vaginal canal by a fistulous communication.
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