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Title: Bilateral ovulation fossa inclusion cysts in Miranda jennets
Authors: Quaresma, M.
Payan-Carreira, R.
Pires, M.A.
Edwards, J.F.
Issue Date: 2011
Abstract: Multiple cysts ranging from 2-111 mm were noted bilaterally in the ovulation fossa of 11 mature Miranda jennets. These ovulation fossa inclusion cysts (OFICs) were lined by a simple low to columnar epithelium that included many ciliated cells. Although most cases were incidental findings, two of the jennets were presented with reduced fertility. Extensive cyst formation could have been responsible for the reproductive problems because they replaced most of the ovarian parenchyma. Due to their close proximity to the ovulation fossa, the OFICs may have mechanically interfered with passage of eggs into the oviduct. OFICs are histologically common in equids, but are reported uncommonly as gross lesions in either mares or jennets. Ovarian inclusion cysts are associated with neoplasia in women; however, these OFICs showed no evidence of epithelial hyperplasia or cellular atypia and no evidence of independent growth, therefore they were considered to be non-neoplastic. The bilateral occurrence and high incidence of OFICs in Miranda jennets, a breed with limited genetic variability, suggests that the lesion has a genetic causation.
Peer Reviewed: yes
Document Type: Article
Appears in Collections:OLD - DZOO - Artigo em Revista Científica Internacional

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