NOTE Surgery A Vaginal Cyst Causing Dysuria and Dyschezia in a Bitch

ABSTRACT. A 9-year-old female dog was referred to Azabu University Veterinary Teaching Hospital for dysuria and dyschezia after ovar-iohysterectomy. After a series of diagnostic imaging, vaginal obstruction was suspected by vaginal fluid retention. Surgical repair was attempted three times to establish patency through the vagina and the vestibule by episiotomy and laparotomy. Another laparotomy was performed to remove the entire vaginal mucosal layer to prevent recurrence, which resulted in favorable outcome. Histopathological exami-nation revealed that the resected tissue was a cyst originated from mesonephric duct remnant. In the present case, the cyst was curable by the entire resection of the cyst lining membrane, which could eradicate all the secretory cells with least damage to the urethral vasculature and innervation. KEY WORDS: canine, dysuria, vaginal cyst. doi: 10.1292/jvms.13-0471; J. Vet. Med. Sci. 76(7): 1039–1043, 2014 A vaginal cyst is a formation of cystic structure within the vaginal wall. It may arise from a remnant of the embryonic urogenital duct or an entrapment of the mucosal epithelium under the mucosal layer by trauma or surgery [1, 2, 8]. Vaginal cysts are classified based on the type of epithe-lial cells that are lining the cyst, such as Müllerian cysts