PMC6529839_01
Sonographic image in transverse plane with patient in dorsal recumbency. A thin-walled cystic structure with echogenic fluid (CYST) is present in the caudal abdomen between the urinary bladder (U Bladder) and colon (COLON).
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F1
Transabdominal ultrasonography revealed a thin walled cystic structure (2.5 x 5.9 cm) containing echogenic fluid in the caudal peritoneum dorsal to the urinary bladder and ventral to the colon, with close association to the uterine horns (Figure 1).
Post-contrast CT image in transverse plane. A well-marginated, peripherally enhancing cyst (CYST) is present in the region of the uterine body causing rightward displacement of the urinary bladder (UB). The mildly dilated uterine horns are seen dorsally (asterisks).
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F2
Computed tomography of the abdomen confirmed the presence of a round, well-marginated, soft-tissue attenuating, peripherally contrast-enhancing space occupying cystic lesion (4 cm H x 7.8 cm L x 4.8 cm W) in the region of the uterine body (Figure 2).
Cystic vaginal structure as viewed in surgery. The vaginal cyst (VC) encompassed the region of the cranial vagina and uterine body. The vaginal mass was closely associated with both ureters and the urethra and formed adhesions to the urinary bladder (UB).
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F3
The uterus was reflected caudally revealing the discrete, round (5 x 5 cm) fluid filled structure caudal to the bifurcation of the uterus (Figure 3). Blunt dissection of the mesometrium was used to expose the cystic lesion, which had formed adhesions to the urinary bladder and was closely associated with the urethra and both ureters (Figure 3).
Macroscopic appearance of surgically removed reproductive tract. Ovaries are grossly normal. Uterus is hypoplasic. Cervix is not grossly visible. Vaginal cyst had been incised to reveal inspissated viscous brown material.
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F4
The cyst contained opaque, viscous brown material (Figure 4).
Macrosopic appearance of sagittal sections of the uterus and vaginal cyst. Dilation of uterine glands consistent with cystic endometrial hyperplasia.
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F5
A sagittal section of the uterus revealed diffuse cystic endometrial dilations (Figure 5).
Sagittal section of the vaginal cyst (VC) revealing a fibrous septum (large arrow) in the region of the cervix. The small arrow denotes the blind end of the uterine horn. Note the absence of a patent cervical canal; no channel was evident between the uterus and the vagina.
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F6
The cervical canal was not present and a fibrous septum was identified in the region of the cervix (Figure 6). The fibrous septum prevented communication between the uterus and vagina, there was no visible channel between the uterus and cranial vagina (Figure 6).
Histological appearance of the endometrium showing moderate cystic endometrial hyperplasia with scattered cystic glands with intraluminal macrophages and adjacent lymphocytic infiltration.
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F7
The uterus had a moderate level of cystic endometrial hyperplasia with normal thickness and glandular development overall, scattered glands were cystic and contained small numbers of degenerate macrophages and occasional glands had tall columnar epithelium with papillary projections (Figure 7). In the endometrial interstitium were occasional foci of lymphocytes and occasional neutrophils accompanied by a very mild inflammatory reaction (Figure 7).
Histologic appearance of vaginal cystic structure with stratified cuboidal epithelium and wall containing smooth muscle.
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F8
The cystic structure of the caudal reproductive tract was formed of smooth muscle lined by a double layer of cuboidal cells, with minimal inflammatory changes (Figure 8).