Merck Manual

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Sonogram of vaginal fluid, mare
Sonogram of vaginal fluid, mare

The urethra attaches to the neck of the bladder and opens into the vestibule at the base of the vestibulovaginal fold, which is the caudal border of the vagina. An accumulation of fluid cranial to the vestibulovaginal fold and dorsal to the bladder is abnormal.

Courtesy of Dr. Patricia Sertich.