Rare forms of ectopic pregnancy are those that develop in accessory tubes or in diverticula of the tube. Of each of these varieties Henrotin and Herzog1 have recently described an instance.
At the fimbriated end of the Fallopian tube may be found certain accessory organs, which are somewhat difficult to describe. Some of them, however, are known under the name of accessory tubes. They consist of a canal with an open free end surrounded by fringes, the other end sometimes opening into the Fallopian tube proper. These structures are congenital malformations, resulting from anomalies of the duct of Müller. It must be mentioned, however, that certain authors believe that these structures and orifices may result from inflammatory processes, followed by proliferation of the wall of the oviduct, with hernia of the mucosa. The histologic study of such accessory organs in serial sections has shown conclusively that they depend upon
ANOMALIES OF THE DUCT OF MÜLLER AS THE CAUSE OF ECTOPIC PREGNANCY. JAMA. 1898;XXXI(13):729–730. doi:10.1001/jama.1898.02450130051006
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