Abstract
ABSTRACT Squamous metaplasia of the rete ovarii is an ovarian pathologic change characterized by replacement of the normal single layered cuboidal epithelium of the rete ovarii by a stratified squamous keratinized epithelium. Uterus and ovaries from a local slaughterhouse pregnant crossbreed cow were evaluated through ultrasound, macroscopically and histologically. Grossly, there were multiple cysts in both ovaries, which were histologically characterized as rete ovarii cysts with squamous metaplasia and intraluminal accumulation of keratinized material. Squamous metaplasia of the rete ovarii has been previously reported in cows, however this is the first report of this condition in a pregnant animal, demonstrating that this ovarian change is compatible with pregnancy.
Highlights
Squamous metaplasia of the rete ovarii is a recently recognized pathologic change of the ovary (Santos et al, 2012), which may have been misinterpreted as teratoma or epidermoid cysts (Santos et al, 2012)
Squamous metaplasia of the rete ovarii has been previously reported in cows, this is the first report of this condition in a pregnant animal, demonstrating that this ovarian change is compatible with pregnancy
This ovarian change is characterized by replacement of the normal single layered cuboidal epithelium of rete ovarii by a keratinized stratified squamous epithelium, which results in accumulation of keratinized material within the lumen of the rete ovarii and cystic dilatation
Summary
Squamous metaplasia of the rete ovarii is a recently recognized pathologic change of the ovary (Santos et al, 2012), which may have been misinterpreted as teratoma or epidermoid cysts (Santos et al, 2012). The right ovary had approximately 4.0 x 2.5 x 2.0cm (length, width and height, respectively), and contained developing follicles, a prominent dark brown mature corpus luteum, and two cystic structures with white thick wall measuring 2.2 x 2.0cm and 0.5 x 0.4cm (Figure 1B). The uterus and uterine tubes had no gross lesions, and the left uterine horn was asymmetric, and contained fluid, fetal membranes, and an embryonic vesicle measuring approximately 3 x 2.5cm, compatible with 40 days of pregnancy (Figure 1D and E). Samples from both ovaries were fixed by immersion in 10% buffered formalin and processed for histopathology. There was abrupt transition from a single or multi-layered cuboidal epithelium to keratinized stratified squamous epithelium, and some cysts were filled with an acidophilic amorphous and acellular material (Figure 2)
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