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In male dogs with recurrent urinary tract obstruction a scrotal urethrostomy creates a permanent opening in the urethra proximal to the area where most stones lodge, behind the os penis. In male cats, stones lodge where the urethra narrows in the penis.
However, the anatomy of the male cat is quite different and the urethra is very small in diameter. Perineal urethrostomy in the male cat was developed in 1962 and published in the Journal of the American Veterinary Medical Association in 1963. [2] It was modified in 1967, [3] and further modified in 1971. [4]
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Perineal hernias are rare in female dogs and uncommon in cats. Dogs with benign prostatic hyperplasia have been found to have increased relaxin levels and suspected subsequent weakening of the pelvic diaphragm. [10] In cats, perineal hernias are seen most commonly following perineal urethrostomy surgery or secondary to megacolon. [11]
For recurrent cases of FIC in male cats where blockage is a risk, and dietary and environmental modifications have not prevented relapse, a last line of treatment to prevent future obstruction is surgery to widen the male urethra. This is called Perineal Urethrostomy (PU) [43] but brings with it other risks and should therefore only be ...
Compressor urethrae muscle in the female is sometimes included [3] Urethrovaginal sphincter in the female is sometimes included [3] other Membranous urethra in the male; proximal portion of urethra in the female; Bulbourethral gland (males). The Bartholin gland, the female counterpart, is in the superficial perineal pouch; Vagina (females)
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