[Uterine serosal inclusion cysts in the dog - case report and literature review of canine uterine cysts].

In bitches, uterine cysts are usually associated with pathological conditions. Serosal inclusion cysts of the uterus represent an exception to this rule. These thin-walled cysts develop on the uterine surface and occur either as single or multiple cysts. The cysts lack endocrine activity and usually do not cause clinical symptoms. Their occurrence shows no association to the estrus cycle. Serosal inclusion cysts are mainly found in older multiparous bitches and large breeds are more often affected. Diagnosis of serosal inclusion cysts may be achieved by transabdominal sonography. Differentiation between uterine and ovarian serosal inclusion cysts is possibly challenging as serosal inclusion cysts are often located in the area of the tip of the uterine horn. This report presents the case of a breeding bitch with multiple uterine serosal inclusion cysts detected during caesarean section. The concentrations of estradiol 17β and progesterone in the cyst fluid corresponded to the blood concentrations of these hormones in a bitch during parturition. The concentrations of total calcium, zinc, copper, and iron in the cyst fluid were below the reference values in canine blood whereas the concentrations of magnesium, phosphorus, sodium, and potassium in the cyst fluid were comparable to pertaining blood levels.