Prevalence of Endometrial Cysts and Their Effect on Fertility

Uterine blood flow and perfusion in mares with uterine cysts: effect of the size of the cystic area and age

“…A progressive increase in the frequency of mares with cysts with the advancing of age (Tannus & Thun 1995) and a lower mean age of mares without cysts (Adams et al 1987, Bracher et al 1992, Eilts et al 1995 agrees with our findings. Although the overall number of cysts and the size of the cystic area increased with age, our findings indicated that old age was associated with increase in the internal cystic area, whereas the size of the external cystic area did not differ between mares of intermediary versus advanced age.…”

“…The cornualbody junction was more affected by internal than external cysts. Considering only mares with both internal and external cysts, a progressive increase in the frequency of internal cysts from the extremities to the cornual-body junction of the uterus was found and agrees with previous reports (Bracher et al 1992, Eilts et al 1995, Tannus & Thun 1995 that suggested a higher prevalence of endometrial cysts in the caudal portion of the uterine horns. During the embryo mobility phase (11-15 days after ovulation; Ginther 1983a, Leith & Ginther 1984), the embryo has been observed to move through cystic areas (Ginther & Pierson 1984).…”

“…The frequency of mares with cysts in this study was greater than that reported previously (Adams et al 1987, Eilts et al 1995, Tannus & Thun 1995. A progressive increase in the frequency of mares with cysts with the advancing of age (Tannus & Thun 1995) and a lower mean age of mares without cysts (Adams et al 1987, Bracher et al 1992, Eilts et al 1995 agrees with our findings.…”

“…Lymphatic cysts start as small microscopic structures that enlarge from several millimeters to several centimeters (Kenney & Ganjam 1975, Kenney 1978 and have reported mean diameters ranging from 2 to 48 mm (Tannus & Thun 1995). Cysts are usually located at or near the base of both horns (Bracher et al 1992, Eilts et al 1995, Tannus & Thun 1995 in the ventral-most portion of the suspended uterus (Ginther & Pierson 1984). The reported incidence in horses ranges from 13 to 55% (Wilson 1985, Adams et al 1987, Bracher et al 1992, Tannus & Thun 1995.…”

Hysteroscopic removal of uterine cysts in mares II - Follow-up and long term fertility analysis with regard to patho-histological findings

“…While some authors assume that uterine cysts do not affect fertility in mares (Eilts et al 1995), other authors observed a history of 10% lower fertility in mares with uterine cysts (Leidl et al 1987) or significantly lower pregnancy rates at day 14 and 40 in mares with cysts (77.6% and 71.4%) compared to mares without cysts (91.3% and 88%) (Tannus and Thun 1995). Although the presence of uterine cysts is no definitive hindrance for pregnancy (Leidl et al 1987), they directly influence transuterine migration of the conceptus between days 6 and 17 after ovulation and lead to a reduction of total area of microcotyledonary contact resulting in lower fertility (Allen et al 1997).…”