PMC6421014_01
PMC6421014_02
(a) and (b) Two functional anal openings. This photograph depicts the locations of the two anal openings, left ( ) and right (*). Both openings were situated off-center from midline by a few millimeters. The left anal opening is positioned more off-center, anatomically narrower, and angled more laterally than the larger right anal opening. (b) Vulva and vestibule. This photograph depicts the complete septum (*) and the small clitoris with smaller than usual openings into each vaginal canal. Dorsal is toward the bottom of the image.
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fig1
On physical examination, the left anal orifice was situated 3-4 mm off midline, was smaller in diameter, and had a slit-like appearance compared to the right anal opening, which was 1-2 mm to the right of midline (Figure 1(a)). Urogenital physical evaluation revealed a complete ventral to dorsal soft tissue septum bisecting the vulva, which can be seen in Figure 1(b).
PMC6421014_03
Dorsal plane CT image of the rectum with positive contrast medium infused through two catheters in each anal opening left (**) and right (*). The contrast is distinctly separate caudally, proceeding cranially in the rectum, and then joins approximately 4.5 cm cranially ( ).
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fig2
The contrast then joined again cranially at the level of the second caudal vertebra (Figure 2).
Transverse CT image at the level of the ischium with nonionic, iodinated contrast medium demonstrating a septate urinary bladder (*) and two distinct urethras (arrows).
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fig3
The left and right portions of the urinary bladder were mildly to moderately filled with fluid and contrast medium (Figure 3).
Urogenital system. The dog had normal kidneys and ureters. One ovary and uterine horn on each side were visualized (*). The urinary bladder complete septum ( ) was seen. A single urethra (arrowheads) exiting on each side of the urinary bladder and then joining each cervix before exiting through separate vaginal canals (arrows).
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fig4
The urethras each extended approximately 4.5 cm caudally and then entered separate duplicated vaginas, each with a separate vaginal canal and opening to the outside of the body (Figure 4).
Colon and rectum. (a) Serosal surface and external anal orifices. (b) Mucosal surface and external anal orifices. The mucosal surface of the colon was completely duplicated with a septum (*) which extended 4.5 cm orally before joining to one colon.
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fig5
Approximately 2 cm from the rectum, there was a similar bifurcation that diverged the colon into two rectal portions and separate anal openings (Figure 5).