Uterine cysts are fluid-filled structures in the endometrium that are typically diagnosed by ultrasonographic examination per rectum. Two types of uterine cysts are described: glandular and lymphatic. Glandular cysts are reported to range in size froma few millimeters to 1 cm in diameter and occur with distention of glands as a result of decreased flow of secretions secondary to periglandular fibrosis. Lymphatic cysts are reported to range in size from several millimeters to 20 cm and result from obstruction of lymph channels. It is possible that lymphatic cysts also occur from pooling of lymph in multiparous mares from the gravitational effects of an enlarged, gravid, or post-partum uterus.
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