Abstract
Squamous metaplasia of rete ovarii is characterized by replacement of the normal cuboidal epithelium of rete ovarii by a keratinized stratified scamous epithelium, leading to accumulation of keratinized material within the tubules and cystic dilatation of rete ovarii. The present study decribes a case of scamous metaplasia of rete ovarii in a 10 year old Zebu cow, including clinical, surgical, ultrasonographic, histopathological and hormonal findings. At first ultrasound examination the cow had lightly asymmetric ovaries with follicles presenting echogenicity similar to luteinized follicular cysts. After transvaginal follicular aspiration creamy yellowish sanguineous-purulent content was recovered. After unilateral ovariectomy the ovary was sectioned and brownish viscous material drained from cystic cavity. Histopathology confirmed the diagnosid of squamous metaplasia of the rete ovarii. Progesterone concentrations assessed by chemiluminescent enzyme immunoassay within different time periods after ovariectomy showed that pathology did not compromise normal luteal ovarian activity in a contralateral reminiscent ovary.
Highlights
Metaplastic changes are relatively common in various organs of the female genital system in ruminants (Santos and Nascimento, 1996; Nascimento and Santos, 2011), only recently a squamous metaplastic lesion of the bovine rete ovarii has been recognized (Santos et al, 2012)
Considering the lack of information regarding clinical changes associated with squamous metaplasia of the rete ovarii in cows, here we describe a case in which clinical parameters have been thoroughly recorded, including clinical, surgical, ultrasonographic, histopathologic, and endocrinologic findings
In the first reported case there was no clinical information available, apparently the cow did not have any detrimental effect on its ovarian cyclic activity since a functional corpus luteum was found in one of the ovaries (Santos et al, 2012)
Summary
Metaplastic changes are relatively common in various organs of the female genital system in ruminants (Santos and Nascimento, 1996; Nascimento and Santos, 2011), only recently a squamous metaplastic lesion of the bovine rete ovarii has been recognized (Santos et al, 2012). As a result of the metaplastic change, there is accumulation of keratinized material within the tubules of the rete ovarii leading to the development of multiple ovarian cysts lined by squamous epithelium and filled with keratinized material (Santos et al, 2012).
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